JPH05238299A - Suspension device for seat on vehicle - Google Patents
Suspension device for seat on vehicleInfo
- Publication number
- JPH05238299A JPH05238299A JP4463292A JP4463292A JPH05238299A JP H05238299 A JPH05238299 A JP H05238299A JP 4463292 A JP4463292 A JP 4463292A JP 4463292 A JP4463292 A JP 4463292A JP H05238299 A JPH05238299 A JP H05238299A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- cam
- air
- seat cushion
- exhaust
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Seats For Vehicles (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主にトラックやオフロ
ード車等の車両用シートのエアサスペンション装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air suspension device for vehicle seats such as trucks and off-road vehicles.
【０００２】[0002]
【従来の技術】一般に、この種の車両用シートのエアサ
スペンション装置は、ロアフレームと、この上方に配し
シートクッションを支持するアッパーフレームとの間
に、リンク機構と空気ばねを設け、この空気ばねの内部
作用圧力でアッパーフレーム上のシートクッションに生
じる荷重を支持するようにしている。2. Description of the Related Art Generally, an air suspension device for a vehicle seat of this type is provided with a link mechanism and an air spring between a lower frame and an upper frame which is disposed above the lower frame and supports a seat cushion. The load acting on the seat cushion on the upper frame is supported by the internal working pressure of the spring.
【０００３】また、着座する人の体重いかんにかかわら
ず静止状態ではシートクッションを設定基準高さに維持
し、しかも走行中の振動に応じ適当なサスペンションス
トロークを確保して最適なクッション性能を得るよう
に、空気ばねの内部空気圧を自動制御するようにしてい
る。In addition, regardless of the weight of the seated person, the seat cushion is maintained at the set reference height in a stationary state, and an appropriate suspension stroke is ensured according to vibration during running so as to obtain optimum cushion performance. In addition, the internal air pressure of the air spring is automatically controlled.
【０００４】この代表的な車両用シートのエアサスペン
ション装置としては、例えば特開昭５４−９７９２４号
公報に示されているようなものがある。これを第１３図
及び第１４図により簡単に説明する。図中１は車両の床
上に固定される枠状のロアフレーム、２はこのロアフレ
ーム１の上方に配し車両用シートのシートクッション
（図示せず）を支持する枠状のアッパーフレームであ
る。このアッパーフレーム２とロアフレーム１との間に
該アッパーフレーム２を上下動可能に支持するリンク機
構３が組み付けられている。An example of this typical vehicle seat air suspension device is shown in Japanese Patent Laid-Open No. 54-97924. This will be briefly described with reference to FIGS. 13 and 14. In the figure, 1 is a frame-shaped lower frame fixed on the floor of the vehicle, and 2 is a frame-shaped upper frame which is arranged above the lower frame 1 and supports a seat cushion (not shown) of a vehicle seat. A link mechanism 3 that supports the upper frame 2 so as to be vertically movable is assembled between the upper frame 2 and the lower frame 1.
【０００５】このリンク機構３は、それぞれ左右一対ず
つのリンクバー３ａ，３ｂを枢支ピン３ｃでＸ状に枢着
すると共に、これらリンクバー３ａ，３ｂの各上下端に
それぞれ左右に亘る連結シャフト３ｄ，３ｅを設け、こ
れら前方に配する上下の連結シャフト３ｄの両端は前記
アッパーフレーム２とロアフレーム１の左右枠部材の前
端寄りに回動可能に連結し、後方に配する連結シャフト
３ｅの両端はアッパーフレーム２とロアフレーム１の左
右枠部に転動コロ３ｆを介し前後動可能に摺合してい
る。In the link mechanism 3, a pair of left and right link bars 3a and 3b are pivotally attached to each other in an X shape by pivot pins 3c, and link shafts extending left and right at upper and lower ends of the link bars 3a and 3b, respectively. 3d and 3e are provided, and both ends of the upper and lower connecting shafts 3d arranged in front of the connecting shaft 3d are rotatably connected to the upper frame 2 and the lower frame 1 toward the front ends of the left and right frame members. Both ends are slidably engaged with the left and right frame portions of the upper frame 2 and the lower frame 1 so as to be movable back and forth through rolling rollers 3f.
【０００６】また、前記ロアフレーム１とアッパーフレ
ーム２間には空気ばね５が設けられ、この空気ばね５の
内部作用圧でシートクッションからアッパーフレーム２
にかかる荷重を支えている。この空気ばね５にコンプレ
ッサー等の給気源（図示せず）から給気させたり該空気
ばね５内部の空気を排気したりする給・排気弁６が、ロ
アフレーム１にブラケット９を介し取付け固定されてい
る。この給・排気弁６は図１４に示す如く一個のケーシ
ングに常閉式の給気弁と排気弁とを内蔵した構成で、そ
の給気弁と排気弁との弁棒７，８が所定の間隔を存して
並列的に突出され、その弁棒７，８が個々に押し込めら
れることにより給気弁及び排気弁が開き、その押し込み
力を解除すると、内蔵した弁ばねの付勢によりそれぞれ
閉弁状態に自動復帰する。An air spring 5 is provided between the lower frame 1 and the upper frame 2, and the internal working pressure of the air spring 5 causes the seat cushion to move from the upper frame 2 to the upper frame 2.
It supports the load applied to. A supply / exhaust valve 6 for supplying air to the air spring 5 from an air supply source (not shown) such as a compressor or exhausting the air inside the air spring 5 is fixed to the lower frame 1 via a bracket 9. Has been done. The air supply / exhaust valve 6 has a structure in which a normally closed air supply valve and an exhaust valve are built in one casing as shown in FIG. 14, and the valve rods 7 and 8 between the air supply valve and the exhaust valve have predetermined intervals. Existing in parallel with each other, and the valve rods 7 and 8 are individually pushed in to open the air supply valve and the exhaust valve, and when the pushing force is released, the valve springs built in close the valves. Automatically returns to the state.
【０００７】この給・排気弁６を開閉せしめる弁切替機
構として一個のカム１０が備えられている。このカム１
０は第１２図に示す如く一枚の略扇形板状をなし、この
前端側頂角部と反対の後端側上下部に盛り上がったカム
面１０ａ，１０ｂを有している。このカム１０が前端部
頂角部を前記リンク機構３の前側下端の連結シャフト３
ｄに回動可能に嵌合して取付けられている。このカム１
０の途中にはシャフト３ｄを中心とする円弧状の長穴１
０ｃが設けられ、この長穴１０ｃにリンクバー３ａから
突設したピン１２が遊嵌されている。このピン１２がリ
ンクバー３ａと一緒に上下動し、そのピン１２が長穴１
０ｃ内での空走距離ｘを過ぎるとカム１０が連動して上
下に回動するようになっている。A single cam 10 is provided as a valve switching mechanism for opening and closing the supply / exhaust valve 6. This cam 1
As shown in FIG. 12, 0 has a substantially fan-shaped plate shape, and has raised cam surfaces 10a and 10b on the upper and lower portions on the rear end side opposite to the apex angle portion on the front end side. The cam 10 has a front end apex angle portion at the front lower end of the link mechanism 3 at the connecting shaft 3
It is rotatably fitted and attached to d. This cam 1
In the middle of 0, an arc-shaped elongated hole 1 centered on the shaft 3d 1
0c is provided, and the pin 12 protruding from the link bar 3a is loosely fitted in the elongated hole 10c. This pin 12 moves up and down together with the link bar 3a, and the pin 12 moves in the long hole 1
When the idling distance x in 0c is exceeded, the cam 10 is interlocked and pivots up and down.
【０００８】このような構成の車両用シートのエアサス
ペンション装置では、体重の重い着座者が座ると、シー
トクッションが予め設定した基準高さから下降し、これ
に伴い第１４図の状態からリンクバー３ａがピン１２と
共に下方に回動し、そのピン１２が長穴１０ｃ内での空
走距離ｘ以上に回動すると、カム１０が連動して押し下
げ回動せしめられる。これで上部のカム面１０ａが給・
排気弁６の弁棒７を押し込んで給気弁を開き、給気源か
らの圧縮空気を空気ばね５に供給し、この空気ばね５の
内部作用圧の増加によりアッパーフレーム２を押し上げ
てシートクッションを上昇させる。この上昇中には弁棒
７がカム面１０ａに押し込められたままで、直ぐに給気
弁が閉じることなく、リンクバー３ａと共にピン１２が
上昇して長穴１０ｃ内の空走距離ｘをすぎてからカム１
０が連動して上方に回動し、この上部のカム面１０ａが
弁棒７から外れて給気弁が閉じ、空気ばね５への給気が
止まってシートクッションが設定基準高さに復帰保持さ
れる。In the air suspension device for a vehicle seat having such a structure, when a seated person having a heavy weight sits down, the seat cushion descends from a preset reference height, and accordingly, the link bar is changed from the state shown in FIG. When 3a rotates downward together with the pin 12 and the pin 12 rotates more than the idling distance x in the elongated hole 10c, the cam 10 is interlocked and pushed down and rotated. With this, the upper cam surface 10a is supplied.
The valve rod 7 of the exhaust valve 6 is pushed in to open the air supply valve, compressed air from the air supply source is supplied to the air spring 5, and the internal working pressure of the air spring 5 increases to push up the upper frame 2 to raise the seat cushion. Raise. During this ascent, the valve rod 7 is still pushed into the cam surface 10a, the intake valve does not close immediately, and the pin 12 ascends together with the link bar 3a to pass the idling distance x in the slot 10c. Cam 1
0 is rotated upwards in conjunction with each other, the cam surface 10a at the upper part is disengaged from the valve rod 7, the air supply valve is closed, the air supply to the air spring 5 is stopped, and the seat cushion is returned to the set reference height and held. To be done.
【０００９】また、前記着座者が座席から離れると、空
気ばね５の内部作用圧によりシートクッションが設定基
準高さから逆に上昇し、これに伴い第１４図の状態から
リンクバー３ａとピン１２と共にカム１０が連動して上
方に回動し、そのピン１２が前記空走距離ｘ以上に回動
すると、この下部のカム面１０ｂが給・排気弁６の弁棒
８を押し込んで排気弁を開き、空気ばね５内の圧縮空気
を排出する。これで空気ばね５の内部作用圧が減少して
シートクッションが下降する。この下降中には弁棒８が
カム面１０ｂに押し込められたままで、直ぐに排気弁が
閉じることなく、リンクバー３ａと共にピン１２が下降
して長穴１０ｃ内の空走距離ｘを過ぎてからカム１０が
下方に回動し、その下部のカム面１０ｂが弁棒８から外
れて排気弁が閉じ、空気ばね５内からの排気が止まって
シートクッションが設定基準高さに復帰保持される。When the seated person moves away from the seat, the seat cushion rises backward from the set reference height due to the internal working pressure of the air spring 5, and accordingly the link bar 3a and the pin 12 from the state shown in FIG. At the same time, when the cam 10 is interlocked and pivots upward, and the pin 12 pivots over the idling distance x or more, the lower cam surface 10b pushes the valve rod 8 of the intake / exhaust valve 6 to open the exhaust valve. It opens and the compressed air in the air spring 5 is discharged. As a result, the internal working pressure of the air spring 5 decreases and the seat cushion descends. During this descent, the valve rod 8 is still pushed into the cam surface 10b, the exhaust valve does not close immediately, and the pin 12 descends together with the link bar 3a to pass the idling distance x in the slot 10c and then the cam. 10 rotates downward, the cam surface 10b at the lower part thereof is disengaged from the valve rod 8, the exhaust valve is closed, the exhaust from the inside of the air spring 5 is stopped, and the seat cushion is returned to and held at the set reference height.
【００１０】つまり、この車両用シートのエアサスペン
ション装置では、シートクッションが設定基準高さから
下降或いは上昇すると、これにリンク機構３のリンクバ
ー３ａを介してピン１２が上下動し、このピン１２がカ
ム１０の長穴１０ｃ内での空走距離ｘを過ぎると、その
ピン１２にカム１０が連動して空気ばね５の給・排気弁
６を動作せしめる構成である。逆に言えばシートクッシ
ョンが設定基準高さから前述の空走距離ｘに見合った範
囲内で上下動しても、空気ばね５は制御されない所謂不
感帯域として設定され、その上下の不感帯域ではサスペ
ンション装置本来の働きである緩衝動作を行い、その上
下の不感帯域を越えると、空気ばね５を制御してシート
クッションを設定基準高さに戻す構成である。That is, in this vehicle seat air suspension device, when the seat cushion is lowered or raised from the set reference height, the pin 12 is moved up and down via the link bar 3a of the link mechanism 3, and the pin 12 is moved up and down. When the free running distance x in the oblong hole 10c of the cam 10 has passed, the cam 10 interlocks with the pin 12 to operate the supply / exhaust valve 6 of the air spring 5. Conversely speaking, even if the seat cushion moves up and down within the range corresponding to the above-mentioned idle travel distance x from the set reference height, the air spring 5 is set as a so-called dead zone where it is not controlled, and in the dead zones above and below that, the suspension is set. When the cushioning operation which is the original function of the apparatus is performed and the upper and lower dead zones are exceeded, the air cushion 5 is controlled to return the seat cushion to the set reference height.
【００１１】[0011]
【発明が解決しようとする課題】ところで、前述した構
成の従来の車両用シートのエアサスペンション装置で
は、シートクッションの設定基準高さから上方及び下方
のそれぞれの不感帯域がピン１２と長穴１０ｃとの空走
距離ｘにより定められ、上下の不感帯域を個々に調整す
ることはできない。In the conventional vehicle seat air suspension apparatus having the above-described structure, the dead zones above and below the seat cushion set reference height are the pin 12 and the slot 10c. It is determined by the free running distance x, and the upper and lower dead zones cannot be adjusted individually.
【００１２】つまり、ピン１２と長穴１０ｃとの寸法関
係を変更しただけでは、設定基準高さから上方の不感帯
域を下方の不感帯域に関係なく狭めたり広げたり、或い
は下方の不感帯を上方の不感帯域に関係なく狭めたり広
げたりする設定はできず、両者略等しく変化してしま
う。そうかと言って、カム１０の上下のカム面１０ａ，
１０ｂ間の距離を前記空走距離ｘと関係なく変更する
と、シートクッションが上下の不感帯域を越えた場合に
設定基準高さに復帰できない不都合が生じる。上下の不
感帯域はそのどちらか一方を設定すると他方も決まって
しまうと言った如く設計の自由度が少ない。That is, simply by changing the dimensional relationship between the pin 12 and the elongated hole 10c, the dead zone above the set reference height can be narrowed or widened regardless of the dead zone below, or the dead zone below can be increased above. It cannot be set to narrow or widen regardless of the dead zone, and both change almost equally. If so, the upper and lower cam surfaces 10a of the cam 10,
If the distance between 10b is changed irrespective of the idling distance x, there is a problem that the seat cushion cannot be returned to the set reference height when the seat cushion exceeds the upper and lower dead zones. The upper and lower dead zones have a low degree of freedom in design, as if one of them is set, the other is also decided.
【００１３】このために、車両の種類や走行状態などの
多種多様な諸条件或いは運転者の好み等に応じ、それぞ
れに最適なクッション作用を得るような上下の不感帯域
の個々の自由な設定ができず、着座者に不快感や疲労感
を与える場合がある。For this reason, according to various conditions such as the type of vehicle and running condition or the driver's preference, the upper and lower dead zones can be individually set so as to obtain the optimum cushioning action. This may result in discomfort and fatigue to the seated person.
【００１４】例えば、トラックやオフロード車など悪路
走行中には路面の凹凸による振動や衝撃がシートに伝わ
るが、その際に下から突き上げるような力、所謂底突き
（ボトミング）が発生すると、着座者は特に不快を感じ
疲労が増長する。これを設定基準高さ並びに上方の不感
帯域の幅を変えずに軽減するには、下方の不感帯域の幅
を独自に広く設定しなければならないが、そのような調
整が出来ない問題がある。For example, when traveling on a bad road such as a truck or an off-road vehicle, vibrations and impacts due to the unevenness of the road surface are transmitted to the seat. At that time, if a force such as pushing up from below, so-called bottoming (bottoming) occurs, The seated person is particularly uncomfortable and tired. In order to reduce this without changing the set reference height and the width of the upper dead zone, the width of the lower dead zone must be independently set wide, but there is a problem that such adjustment cannot be performed.
【００１５】また一方、カム１０が排気弁及び給気弁を
開くまでの上下の不感帯域は前述の如くピン１２と長穴
１０ｃとの間の空走距離ｘにより定められているが、そ
のピン１２の空走距離ｘ分の移動はシートクッションの
設定基準高さからの上下動に伴うリンクバー３ａの上方
及び下方への所定の回動（角度変化θ）である。しかし
ながら、シートクッションの設定基準高さからの上下動
距離Ｈとリンクバー３ａの上下の角度変化θとは完全に
比例関係ではなく、リンクバー３ａの長さをＬとする
と、 θ＝２× sin-1（Ｈ／Ｌ） と言った正弦曲線を描く関係にある。On the other hand, the upper and lower dead zones until the cam 10 opens the exhaust valve and the intake valve are determined by the idling distance x between the pin 12 and the slot 10c as described above. The movement of 12 by the idling distance x is a predetermined rotation (angle change θ) of the link bar 3a upwards and downwards due to the vertical movement of the seat cushion from the set reference height. However, the vertical movement distance H from the set reference height of the seat cushion and the vertical angle change θ of the link bar 3a are not in a completely proportional relationship, and if the length of the link bar 3a is L, then θ = 2 × sin It has a relationship to draw a sine curve called -1 (H / L).
【００１６】このため、リンクバー３ａの長さとシート
クッションの基準高さとの選定によっては、リンクバー
３ａの上下の角度変化θ（空走距離ｘ）によるシートク
ッションの上方の不感帯域と下方の不感帯域とが互いに
大幅に相違する事態が生じる。つまり、設定基準高さか
らカム１０が排気弁を開くまでのシートクッションの上
昇距離と、カム１０が給気弁を開く間でのシートクッシ
ョンの下降距離とが互いに異なってしまう場合があり、
その修正ができない。Therefore, depending on the selection of the length of the link bar 3a and the reference height of the seat cushion, the upper dead zone and the lower dead zone of the seat cushion due to the vertical angle change θ (running distance x) of the link bar 3a. A situation occurs in which the band and the band are significantly different from each other. That is, the ascending distance of the seat cushion from the set reference height until the cam 10 opens the exhaust valve and the descending distance of the seat cushion while the cam 10 opens the air supply valve may be different from each other.
I can't fix it.
【００１７】こうした場合、例えばボトミング（底突
き）を極力避けるため、下方の不感帯域を適度に広くと
るべく空走距離ｘを定めると、上方の不感帯域が狭くな
りすぎたり逆に必要以上に広くなりすぎたりする。その
上方の不感帯域が狭すぎると、頻繁に排気弁の開閉動作
が繰り返され、シートクッションが設定基準高さより徐
々に低くなって給気が行われるまで復帰できな事態が起
きたり、排気弁が短期間で激しく摩耗してしまったりす
る問題がある。また逆に上方の不感帯域が必要以上に広
すぎると、体重の重い人が座った後は空気ばねの高い内
圧によりシートクッションが高位置に上昇したままとな
り、次に軽い人が座る場合に設定基準高さに戻らないな
どの不都合が生じる。In such a case, for example, in order to avoid bottoming as much as possible, if the idling distance x is set so that the lower dead zone is appropriately wide, the upper dead zone becomes too narrow, or conversely becomes wider than necessary. Too much. If the dead zone above it is too narrow, the opening / closing operation of the exhaust valve will be repeated frequently, and the seat cushion will gradually fall below the set reference height and it will not be possible to recover until air is supplied, or the exhaust valve will There is a problem of severe wear in a short period of time. On the other hand, if the upper dead zone is wider than necessary, the seat cushion will remain in a high position due to the high internal pressure of the air spring after a heavy person sits, and the next lighter person will set it. This causes inconveniences such as not returning to the standard height.
【００１８】本発明は前記事情に鑑みなされ、その目的
とするところは、そのシートクッションの設定基準高さ
から上方及び下方それぞれの不感帯域を、狭すぎたり必
要以上に広すぎたりしない範囲で、個々に自由に設定す
ることができて、シートクッションを着座者の体重等に
かかわらずシートクッションを常に効率良く設定基準高
さに復帰維持できると共に、車両の種類や走行状態など
の多種多様な諸条件或いは運転者の好み等に応じ、それ
ぞれ最適なクッション作用が得られるように設定が可能
で、走行振動による着座者の不快感や疲労感を軽減でき
る車両用シートのエアサスペンション装置を提供するこ
とにある。The present invention has been made in view of the above circumstances, and it is an object of the present invention to set the dead zones above and below the set reference height of the seat cushion so as not to be too narrow or unnecessarily wide. The seat cushion can be set individually, and the seat cushion can be efficiently returned to and maintained at the set reference height regardless of the weight of the seated person, and various types of vehicles such as vehicle types and running conditions can be set. To provide an air suspension device for a vehicle seat, which can be set according to conditions or driver's preference so as to obtain an optimum cushioning effect and can reduce discomfort and fatigue of a occupant due to traveling vibration. It is in.
【００１９】[0019]
【課題を解決するための手段】本発明の車両用シートの
エアサスペンション装置は、前記目的を達成するため
に、ロアフレームと、このロアフレームの上方に配され
車両用シートのシートクッションを支持するアッパーフ
レームと、前記ロアフレームに対しアッパーフレームを
上下動可能に支持するリンク機構と、前記アッパーフレ
ームに生じる荷重を支える空気ばねと、前記空気ばねに
給気源から給気させたり該空気ばね内部から排気したり
する常閉式の給・排気弁と、前記シートクッションの上
下動に連動して前記給・排気弁を選択的に開く弁切替機
構とを備え、この弁切替機構による給・排気弁の開閉に
より空気ばね内圧を制御してシートクッションを設定基
準高さに復帰せしめる構成で、In order to achieve the above object, an air suspension device for a vehicle seat of the present invention supports a lower frame and a seat cushion of the vehicle seat which is arranged above the lower frame. An upper frame, a link mechanism that supports the upper frame so that the upper frame can move up and down with respect to the lower frame, an air spring that supports a load generated in the upper frame, and an air supply source for the air spring or the inside of the air spring. A normally closed supply / exhaust valve that exhausts air from the vehicle and a valve switching mechanism that selectively opens the supply / exhaust valve in conjunction with the vertical movement of the seat cushion. With the configuration to control the internal pressure of the air spring by opening and closing, to restore the seat cushion to the set reference height,
【００２０】且つ前記弁切替機構は、前記シートクッシ
ョンの上下動に伴い前記給・排気弁を支持する部材と相
対変位を生じる部材に各々取付けた給気用カムと排気用
カムとよりなり、この給気用カムはシートクッションの
設定基準高さからの下降に伴い一方向に所定距離以上移
動すると前記給気弁の弁棒を押し込んで開弁させる段状
カム面を有すると共に、その開弁後は該段状カム面に隣
接するガイド部で弁棒を押し込んだままシートクッショ
ンが設定基準高さに上昇復帰するまで開弁状態を維持し
ながら他方向に復帰移動する構成で、前記排気用カムは
シートクッションの設定基準高さからの上昇に伴い他方
向に所定距離以上移動すると前記排気弁の弁棒を押し込
んで開弁させる段状カム面を有すると共に、その開弁後
は該段状カム面に隣接するガイド部で弁棒を押し込んだ
ままシートクッションが設定基準高さに下降復帰するま
で開弁状態を維持しながら一方向に復帰移動する構成と
したことを特徴とする。The valve switching mechanism is composed of an air supply cam and an exhaust cam, which are respectively attached to a member that supports the supply / exhaust valve and a member that causes relative displacement as the seat cushion moves up and down. The air supply cam has a stepped cam surface that pushes the valve rod of the air supply valve to open the valve when the seat cushion moves from the set reference height in one direction by a predetermined distance or more. Is a structure for returning and moving in the other direction while maintaining the valve open state until the seat cushion rises and returns to the set reference height while pressing the valve rod with the guide portion adjacent to the stepped cam surface. Has a stepped cam surface that pushes the valve rod of the exhaust valve to open the valve when the seat cushion moves from the set reference height in the other direction by a predetermined distance or more. On the surface Characterized by being configured to return movement in one direction while the seat cushion remains pushed the valve rod in the guide portion in contact maintains the open state until the descending return to set reference height.
【００２１】[0021]
【作用】前記構成の車両用シートのエアサスペンション
装置によれば、シートクッションと共にアッパーフレー
ムがリンク機構を介し上下動すると、弁切替機構の給気
用カムと排気用カムとが給・排気弁と相対変位を生じる
ように往復動する。この際、シートクッションの上下動
が設定基準高さからある範囲以内であれば、即ち給気用
カムと排気用カムとが一方向或いは他方向に所定距離以
上に移動しなければ、その排気用カムと給気用カムの段
状カム面に給・排気弁のいずれの弁棒も押し込められ
ず、その給・排気弁が閉じたままで、空気ばねに対する
給・排気が一切行われない所謂不感帯域となって、その
空気ばねがシートクッションの上下振動の緩衝を行う。According to the vehicle seat air suspension apparatus having the above structure, when the seat cushion and the upper frame move up and down through the link mechanism, the air supply cam and the air exhaust cam of the valve switching mechanism function as the air supply / exhaust valve. Reciprocates to generate relative displacement. At this time, if the vertical movement of the seat cushion is within a certain range from the set reference height, that is, unless the air supply cam and the exhaust cam move in one direction or the other direction by a predetermined distance or more, The so-called dead zone in which neither the valve rod of the supply / exhaust valve can be pushed into the stepped cam surface of the cam or the supply air cam, and the supply / exhaust valve is closed and the air spring is not supplied / exhausted at all. Then, the air spring cushions the vertical vibration of the seat cushion.
【００２２】ここで体重の重い人が座るなどして、シー
トクッションが設定基準高さから前述の不感帯域を越え
て下降すると、これに伴い給気用カムが一方向に所定距
離以上移動して、この段状カム面で給気弁の弁棒を押し
込んで開弁させる。これで給気源からの圧縮空気が空気
ばねに供給され、この空気ばねの内部作用圧が増加して
アッパーフレームを押し上げ、シートクッションを上昇
復帰させる。When the seat cushion is lowered from the set reference height beyond the dead zone as described above, such as when a heavy person sits down, the air supply cam moves in one direction for a predetermined distance or more. , The stepped cam surface pushes the valve rod of the air supply valve to open the valve. As a result, compressed air from the air supply source is supplied to the air spring, the internal working pressure of the air spring increases, pushes up the upper frame, and raises and restores the seat cushion.
【００２３】その開弁後のシートクッションの上昇復帰
中には、給気用カムがガイド部で弁棒を押し込んだまま
給気弁を開いた状態を維持しながら他方向に復帰移動す
る。その間、給気源から圧縮空気が空気ばねに供給し続
けられる。そして、シートクッションが空気ばねにより
押し上げられて設定基準高さまで上昇すると、給気用カ
ムのガイド部から弁棒が外れて自己付勢力により突出動
作し、これで給気弁が閉じ、空気ばねへの圧縮空気の供
給が止まってシートクッションが元の設定基準高さに復
帰保持される。After the seat cushion is lifted and returned after the valve is opened, the air supply cam moves in the other direction while keeping the air supply valve open while the valve rod is pushed in by the guide portion. Meanwhile, the compressed air is continuously supplied to the air spring from the air supply source. Then, when the seat cushion is pushed up by the air spring and rises to the set reference height, the valve rod comes off from the guide part of the air supply cam and the self-biasing force causes the projecting operation. The supply of compressed air is stopped, and the seat cushion is returned to and held at the original set reference height.
【００２４】逆に、シートクッションが設定基準高さか
ら前述の不感帯域を越えて上昇すると、これに伴い排気
用カムが他方向に所定距離以上移動して、この段状カム
面で排気弁の弁棒を押し込んで開弁させる。これで空気
ばね内の圧縮空気が排出され、この空気ばねの内部作用
圧が減少してアッパーフレームと共にシートクッション
が下降復帰する。On the contrary, when the seat cushion rises from the set reference height over the dead zone, the exhaust cam moves in the other direction for a predetermined distance or more, and the stepped cam surface causes the exhaust valve to move. Push in the valve stem to open the valve. As a result, the compressed air in the air spring is discharged, the internal working pressure of the air spring is reduced, and the seat cushion is lowered and returned together with the upper frame.
【００２５】その開弁後のシートクッションの下降復帰
中も、排気用カムがガイド部で弁棒を押し込んだまま排
気弁を開いた状態を維持しなが一方方向に復帰移動す
る。その間、空気ばね内の圧縮空気が排出し続けられ
る。そして、シートクッションが設定基準高さまで下降
すると、排気用カムのガイド部から弁棒が外れて自己付
勢力により突出動作し、これで排気弁が閉じ、空気ばね
内からの排気が止まってシートクッションが元の設定基
準高さに復帰保持される。Even after the seat cushion is returned to the lowered position after the valve is opened, the exhaust cam moves in the one direction while keeping the exhaust valve open with the guide rod pushing the valve rod. Meanwhile, the compressed air in the air spring is continuously discharged. Then, when the seat cushion descends to the set reference height, the valve rod comes off the guide part of the exhaust cam, and the self-biasing force causes the valve to protrude, which closes the exhaust valve and stops the exhaust from the air spring to stop the seat cushion. Is returned to and held at the original set reference height.
【００２６】こうした構成の車両用シートのエアサスペ
ンション装置においては、弁切替機構として給気弁と排
気弁との各々専用の給気用カムと排気用カムとを備えて
いるので、その給気用カムと排気用カムとの各々の段状
カム面の長さをそれぞれ独自に選定することで、シート
クッションが設定基準高さから下降して給気用カムが給
気弁を開く間での距離（下方の不感帯域）と、シートク
ッションが設定基準高さから上昇して排気用カムが排気
弁を開く間での距離（上方の不感帯域）とを各々個々に
狭めたり広げたり自由に設定することが可能となる。し
かもその給気用カムと排気用カムとの各々の段状カム面
の長さを互いに異なる状態に選定しても、その給気用カ
ムと排気用カムとは、いずれも給気弁或いは排気弁を一
度開いた後、その弁棒をガイド部で押し込んだまま開弁
状態を維持しながら元の位置に復帰移動してから閉弁動
作させるので、何ら問題なくシートクッションを確実に
設定基準高さに復帰保持できるようになる。In the vehicle seat air suspension apparatus having such a structure, the air supply cam and the exhaust cam, which are exclusive to the air supply valve and the exhaust valve, are provided as the valve switching mechanism. By independently selecting the length of each stepped cam surface of the cam and exhaust cam, the distance between the seat cushion lowering from the set reference height and the air supply cam opening the air supply valve (Lower dead zone) and the distance between the seat cushion rising from the set reference height and the exhaust cam opening the exhaust valve (upper dead zone) can be individually set by narrowing or widening. It becomes possible. Moreover, even if the lengths of the stepped cam surfaces of the air supply cam and the air exhaust cam are selected to be different from each other, both the air supply cam and the air exhaust cam will not operate either on the air intake valve or the air exhaust valve. After opening the valve once, the valve cushion is pushed in by the guide part and the valve is returned to its original position while maintaining the valve open state, and then the valve is closed. You will be able to return and hold.
【００２７】このために、シートクッションの設定基準
高さから上方及び下方それぞれの不感帯域を、狭すぎた
り必要以上に広すぎたりしない範囲で、個々に自由に設
定することができて、シートクッションを着座者の体重
等にかかわらずシートクッションを常に効率良く設定基
準高さに復帰維持できると共に、車両の種類や走行状態
などの多種多様な諸条件或いは運転者の好み等に応じ、
それぞれ最適なクッション作用が得られるように設定が
可能で、走行振動による着座者の不快感や疲労感を軽減
できるようになる。For this reason, the dead zones above and below the seat cushion set reference height can be set individually within a range that is neither too narrow nor too wide, and the seat cushion can be set freely. The seat cushion can always be efficiently returned to and maintained at the set reference height regardless of the weight of the seated person, and according to various conditions such as the type of vehicle and running condition or the driver's preference,
Each of them can be set so as to obtain an optimum cushioning effect, and it is possible to reduce discomfort and fatigue of a seated person due to running vibration.
【００２８】[0028]
【実施例】以下、本発明の一実施例を図１乃至図１２に
より説明する。なお、図中図１３及び図１４に示した構
成と重複するものには同一符号を付して説明の簡略化を
図る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, the same components as those shown in FIGS. 13 and 14 are designated by the same reference numerals to simplify the description.
【００２９】まず、図３は車両用シートのエアサスペン
ション装置の一部断面した側面図で、従来と略同様に車
両の床Ａ上に固定されるロアフレーム１と、このロアフ
レーム１の上方に配し車両用シートのシートクッション
（図示せず）を支持するアッパーフレーム２と、前記ロ
アフレーム１に対しアッパーフレーム２を上下動可能に
支持するリンク機構３と、前記アッパーフレーム２に生
じる荷重を支える空気ばね５と、前記空気ばね５にコン
プレッサー等の給気源（図示せず）から給気させたり該
空気ばね５内部の空気を排気したりする給・排気弁１６
と、前記シートクッションが設定基準高さから上下動し
て所定の不感帯域を越えると前記給・排気弁１６を選択
的に開いて空気ばね５の内圧を制御することにより該シ
ートクッションを設定基準高さに復帰せしめる弁切替機
構３０とが備えられている。なお、このエアサスペンシ
ョン装置では前記ロアフレーム１とアッパーフレーム２
との間に介在してショックアブソーバ１１が備えられて
いている。First, FIG. 3 is a partially sectional side view of an air suspension device for a vehicle seat, which shows a lower frame 1 fixed on a floor A of a vehicle and an upper portion of the lower frame 1 in the same manner as in the prior art. An upper frame 2 for supporting a seat cushion (not shown) of an arranged vehicle seat, a link mechanism 3 for vertically moving the upper frame 2 relative to the lower frame 1, and a load generated on the upper frame 2. A supporting air spring 5 and a supply / exhaust valve 16 for supplying air to the air spring 5 from an air supply source (not shown) such as a compressor or exhausting the air inside the air spring 5.
When the seat cushion moves up and down from the set reference height and exceeds a predetermined dead zone, the supply / exhaust valve 16 is selectively opened to control the internal pressure of the air spring 5 to set the seat cushion. A valve switching mechanism 30 for returning to the height is provided. In this air suspension device, the lower frame 1 and the upper frame 2 are
And a shock absorber 11 is provided between and.
【００３０】前記給・排気弁１６は図１及び図２に示す
如く一個のケーシングに常閉式の給気弁と排気弁とを内
蔵した構成で、その給気弁の弁棒１７がケーシングの右
側面の後端寄り部から突出され、排気弁の弁棒１８がケ
ーシングの左側面の前端寄りから突出され、それらの弁
棒１７，１８が個々に押し込められることにより給気弁
及び排気弁が開き、その押し込み力を解除すると弁ばね
の付勢により各々閉弁状態に自動復帰する。As shown in FIGS. 1 and 2, the supply / exhaust valve 16 has a structure in which a normally-closed intake valve and an exhaust valve are built in one casing, and the valve rod 17 of the intake valve is on the right side of the casing. Of the exhaust valve, the valve stem 18 of the exhaust valve is projected from the front side of the left side of the casing, and the valve stems 17 and 18 are individually pushed to open the intake valve and the exhaust valve. , When the pushing force is released, the valve spring automatically urges each valve to return to its closed state.
【００３１】この給・排気弁１６はシートクッションの
上下動に伴い互いに相対的に変位を生じる２つの部材の
一方に取付固定されている。即ち、図１乃至図３に示す
如く、前記ロアフレーム１の左右枠部材１ｂ相互間に横
架したビーム１９上に取付ベース２０を介し給・排気弁
１６が水平状態で取付固定されている。この給・排気弁
１６の一方の接続口１６ａにはコンプレッサー等の給気
源（図示せず）と連通する配管２２が接続され、他方の
接続口１６ｂには前記空気ばね５と連通する配管２３が
接続されている。なお図１中１６ｃは多孔質部材より構
成された排気口である。The supply / exhaust valve 16 is attached and fixed to one of two members that are displaced relative to each other as the seat cushion moves up and down. That is, as shown in FIGS. 1 to 3, the supply / exhaust valve 16 is mounted and fixed in a horizontal state on the beam 19 which is horizontally extended between the left and right frame members 1b of the lower frame 1 via the mounting base 20. A pipe 22 communicating with an air supply source (not shown) such as a compressor is connected to one connection port 16a of the air supply / exhaust valve 16, and a pipe 23 communicating with the air spring 5 is connected to the other connection port 16b. Are connected. Note that reference numeral 16c in FIG. 1 denotes an exhaust port made of a porous member.
【００３２】前記弁切替機構３０は、前記給・排気弁１
６を制御して空気ばね５の内部作用圧を増減すること
で、図３に示す如くシートクッションの基準高さＭを設
定すると共に、その設定基準高さＭから上方不感帯域Ｂ
と下方不感帯域Ｃをそれぞれ設定するものである。The valve switching mechanism 30 includes the supply / exhaust valve 1
By controlling 6 to increase / decrease the internal working pressure of the air spring 5, the reference height M of the seat cushion is set as shown in FIG. 3, and the dead zone B above the set reference height M is set.
And the lower dead zone C are set respectively.
【００３３】即ち、この弁切替機構３０は、図１及び図
２に示す如く、給気用カム３１と排気用カム４１とを備
えてなる。この給気用カム３１と排気用カム４１はそれ
ぞれ前後方向に長尺な角棒状のもので、各々の後端部に
下向きのＵ字形係合部３２，４２が一体成形され、この
係合部３２，４２を前記シートクッションの上下動に伴
い前記給・排気弁１６を支持する部材（ロアフレーム
１）と前後方向に相対変位を生じる部材即ち、前記Ｘ状
リンク機構３のリンクバー３ｂ下端の連結シャフト３ｅ
に騎乗状態に係合することで、互いに前記取付ベース２
０上の給・排気弁１６の左右に並列状態に配して、該連
結シャフト３ｅと共に前後動可能に且つ該連結シャフト
３ｅに対し回動可能に取付けられている。That is, the valve switching mechanism 30 comprises an air supply cam 31 and an exhaust cam 41 as shown in FIGS. The air supply cam 31 and the exhaust cam 41 are rectangular rods that are long in the front-rear direction, and downward U-shaped engaging portions 32 and 42 are integrally formed at the rear end portions of these cams. The members 32 and 42 that are displaced relative to the member (lower frame 1) that supports the supply / exhaust valve 16 in the front-rear direction with the vertical movement of the seat cushion, that is, the lower end of the link bar 3b of the X-shaped link mechanism 3. Connection shaft 3e
The mounting bases 2 are engaged with each other by engaging them in a riding state.
The upper and lower supply / exhaust valves 16 are arranged in parallel with each other, and are attached so as to be movable back and forth together with the connecting shaft 3e and rotatable with respect to the connecting shaft 3e.
【００３４】この給気用カム３１は図４に示す如く内側
上半部の面に略中間から前端までに亘る横向きの段状カ
ム面３３を有している。この段状カム面３３は該給気用
カム３１の後方から順に連続して凹面部３３ａと斜面部
３３ｂと凸面部３３ｃとを持つ構成である。また、この
給気用カム３１はこの内側面に浅い溝状ガイド部３４を
有している。この溝状ガイド部３４は前記段状カム面３
３の凸面部３３ｃから一旦斜降して前記斜面部３３ｂと
凹面部３３ａとを避ける状態で後方に伸ばされている。
なお、給気用カム３１の内側略後半部には上下全幅に亘
り切欠した凹状逃げ部３５が設けられてる。As shown in FIG. 4, the air supply cam 31 has a laterally-arranged stepped cam surface 33 extending from substantially the middle to the front end on the inner upper half surface. The stepped cam surface 33 has a concave surface portion 33a, a sloped surface portion 33b, and a convex surface portion 33c which are continuously formed from the rear of the air supply cam 31. The air supply cam 31 has a shallow groove-shaped guide portion 34 on its inner side surface. The groove-shaped guide portion 34 is provided on the stepped cam surface 3
The third convex surface portion 33c descends once and extends rearward in a state of avoiding the slope surface portion 33b and the concave surface portion 33a.
In addition, a concave escape portion 35 which is cut out over the entire width in the vertical direction is provided in a substantially rear half portion inside the air supply cam 31.
【００３５】そして前記シートクッションが設定基準高
さＭから下降して給気用カム３１が連結シャフト３ｅと
共に図６の状態から図７に示すように後方向に所定距離
Ｄ以上移動すると、この段状カム面３３の斜面部３３ｂ
で給気弁の弁棒１７を押し込んで開弁させる。この開弁
後は即座にその弁棒１７を図８に示す如く凸面部３３ｃ
の浅い溝状ガイド部３４で受入れ、その弁棒１７を押し
込んだまま開弁状態を維持する。この状態でシートクッ
ションの上昇復帰に伴い連結シャフト３ｅと共に給気用
カム３１が前方向に復帰移動する際は、図９に示す如く
弁棒１７に溝状ガイド部３４が摺合して該給気用カム３
１が上方に少し回動しながら復帰移動する。そしてシー
トクッションが設定基準高さＭに上昇復帰する時点で、
図６に示した如く給気用カム３１が元の位置に復帰し、
これで溝状ガイド部３４から弁棒１７が抜け外れて突出
動作し、その給気弁が閉弁するようになっている。When the seat cushion is lowered from the set reference height M and the air supply cam 31 is moved together with the connecting shaft 3e from the state of FIG. 6 in the rearward direction by a predetermined distance D or more as shown in FIG. Slope portion 33b of the cam surface 33
The valve rod 17 of the air supply valve is pushed in to open the valve. Immediately after this valve opening, the valve rod 17 is immediately moved to the convex portion 33c as shown in FIG.
It is received by the shallow groove-shaped guide portion 34, and the valve open state is maintained while the valve rod 17 is pushed in. In this state, when the air supply cam 31 moves forward together with the connecting shaft 3e as the seat cushion rises and returns, as shown in FIG. 9, the groove-shaped guide portion 34 slides on the valve rod 17 to cause the air supply. Cam 3
1 returns slightly while rotating upward. When the seat cushion rises to the set reference height M and returns,
As shown in FIG. 6, the air supply cam 31 returns to its original position,
As a result, the valve rod 17 comes off from the groove-shaped guide portion 34 to perform the projecting operation, and the air supply valve is closed.
【００３６】前記排気用カム４１は図４に示す如く内側
上半部の面に略中間から前端までに亘る横向きの段状カ
ム面４３を有している。この段状カム面４３は該排気用
カム４１の前端から後方に向け順に連続して凹面部４３
ａと斜面部４３ｂと凸面部４３ｃとを持つ構成である。
また、この排気用カム４１はこの内側面に浅い溝状ガイ
ド部４４を有している。この溝状ガイド部４４は前記段
状カム面４３の凸面部４３ｃから一旦斜降して前記斜面
部４３ｂと凹面部４３ａとを避ける状態で前方に伸ばさ
れている。As shown in FIG. 4, the exhaust cam 41 has a laterally-arranged stepped cam surface 43 extending from the middle to the front end on the inner upper half surface. The stepped cam surface 43 is continuously recessed from the front end of the exhaust cam 41 toward the rear.
It has a configuration including a, a sloped portion 43b, and a convexed portion 43c.
Further, the exhaust cam 41 has a shallow groove-shaped guide portion 44 on its inner side surface. This groove-shaped guide portion 44 is inclined downward from the convex surface portion 43c of the stepped cam surface 43 and is extended forward while avoiding the inclined surface portion 43b and the concave surface portion 43a.
【００３７】そして前記シートクッションが設定基準高
さＭから上昇して排気用カム４１が連結シャフト３ｅと
共に図６の状態から図１０に示すように前方向に所定距
離Ｅ以上移動すると、この段状カム面４３の斜面部４３
ｂで排気弁の弁棒１８を押し込んで開弁させる。この開
弁後は即座にその弁棒１８を図１１に示す如く凸面部４
３ｃの浅い溝状ガイド部４４で受入れ、その弁棒１８を
押し込んだまま開弁状態を維持する。この状態でシート
クッションの下降復帰に伴い連結シャフト３ｅと共に排
気用カム４１が後方向に復帰移動する際は、図１２に示
す如く弁棒１８に溝状ガイド部４４が摺合して該排気用
カム４１が上方に少し回動しながら復帰移動する。そし
てシートクッションが設定基準高さＭに下降復帰する時
点で、図６に示した如く排気用カム４１が元の位置に復
帰し、これで溝状ガイド部４４から弁棒１８が抜け外れ
て突出動作し、その排気弁が閉弁するようになってい
る。つまり、給気用カム３１が給気弁を開くまでの後方
向の移動距離Ｄにより、シートクッションの設定基準高
さＭからの下方の不感帯域Ｃが定められ、排気用カム４
１が排気弁を開くまでの前方向の移動距離Ｅにより、シ
ートクッションの設定基準高さＭからの上方の不感帯域
Ｂが定められている。従って給気用カム３１の段状カム
面３３のＤ寸法と排気用カム４１の段状カム面４３のＥ
寸法を適当に設定すれば、シートクッションの設定基準
高さＭからの上方及び下方の不感帯域Ｂ，Ｃを個々に自
由に変更できる構成である。When the seat cushion is lifted from the set reference height M and the exhaust cam 41 moves forward together with the connecting shaft 3e from the state shown in FIG. 6 to a predetermined distance E as shown in FIG. Slope portion 43 of cam surface 43
At b, the valve stem 18 of the exhaust valve is pushed in to open the valve. Immediately after this valve opening, the valve stem 18 is moved to the convex portion 4 as shown in FIG.
It is received by the shallow groove guide portion 44 of 3c, and the valve open state is maintained while the valve rod 18 is pushed in. In this state, when the exhaust cam 41 moves backward together with the connecting shaft 3e as the seat cushion descends and returns, as shown in FIG. 12, the groove-shaped guide portion 44 slides on the valve rod 18 to slide the exhaust cam 41. 41 makes a return movement while rotating slightly upward. When the seat cushion returns to the set reference height M, the exhaust cam 41 returns to its original position as shown in FIG. 6, whereby the valve rod 18 comes off from the groove-shaped guide portion 44 and projects. It operates and its exhaust valve is closed. That is, the dead zone C below the set reference height M of the seat cushion is determined by the rearward movement distance D until the air supply cam 31 opens the air supply valve.
The forward moving distance E until 1 opens the exhaust valve defines the dead zone B above the set reference height M of the seat cushion. Therefore, the D dimension of the stepped cam surface 33 of the air supply cam 31 and the E dimension of the stepped cam surface 43 of the exhaust cam 41.
By appropriately setting the dimensions, the dead zones B and C above and below the set reference height M of the seat cushion can be freely changed individually.
【００３８】図５はエアサスペンション高さ（シートク
ッションの上下動高さ）とＸリンク機構３の連結シャフ
ト３ｅの変位（給気用カム３１と排気用カム４１の前後
動距離）との関係を示すもので、サスペンションの上限
高さを１３０mm、下限高さを４４mm、設定基準高さＭを
９０mmとすると共に、ボトミング（底突き）を極力避け
るために下方の不感帯域Ｃを２０mmと広く設定した場
合、給気用カム３１の段状カム面３３のＤ寸法は６．２
５mmとする必要がある。この場合に排気用カム４１の段
状カム面４３のＥ寸法を該Ｄ寸法と同じく設定すると、
上方の不感帯域Ｂが狭くなりすぎて頻繁に排気弁の開閉
動作が繰り返される問題が起きることから、その上方の
不感帯域Ｂが必要以上に広くなりすぎない範囲で適当に
得られるように（ここでは下方の不感帯域Ｃと同等の２
０mmとなるように）、Ｅ寸法は９．２５mmに設定してい
る。FIG. 5 shows the relationship between the height of the air suspension (the height of vertical movement of the seat cushion) and the displacement of the connecting shaft 3e of the X-link mechanism 3 (the longitudinal movement distance between the air supply cam 31 and the exhaust cam 41). As shown, the upper limit height of the suspension is 130 mm, the lower limit height is 44 mm, the set reference height M is 90 mm, and the lower dead zone C is set wide to 20 mm to avoid bottoming as much as possible. In this case, the dimension D of the stepped cam surface 33 of the air supply cam 31 is 6.2.
It should be 5 mm. In this case, if the E dimension of the stepped cam surface 43 of the exhaust cam 41 is set to be the same as the D dimension,
Since the upper dead zone B becomes too narrow and the opening and closing operations of the exhaust valve are frequently repeated, the upper dead zone B should be appropriately obtained within a range that is not unnecessarily wide (here 2 which is equivalent to the lower dead zone C
E dimension is set to 9.25 mm so that it becomes 0 mm).
【００３９】而して、前述した車両用シートのエアサス
ペンション装置によれば、図３に示す如く、自動車の走
行振動等により、シートクッションがアッパーフレーム
２と共にリンク機構３を介し上下動すると、そのリンク
機構３の下側後部の連結シャフト３ｅがロアフレーム１
に対し前後動する。この連結シャフト３ｅの前後動に伴
い弁切替機構３０の給気用カム３１と排気用カム４１と
が同期して前後方向に往復動せしめられる。According to the above-described vehicle seat air suspension apparatus, when the seat cushion moves up and down together with the upper frame 2 via the link mechanism 3 due to traveling vibration of the automobile, as shown in FIG. The connecting shaft 3e at the lower rear part of the link mechanism 3 has a lower frame 1
To move back and forth. As the connecting shaft 3e moves back and forth, the air supply cam 31 and the exhaust cam 41 of the valve switching mechanism 30 reciprocate in the front-rear direction in synchronization.
【００４０】この際、シートクッションの上下動が設定
基準高さＭから上下の不感帯域Ｂ，Ｃの範囲以内であれ
ば、給気用カム３１と排気用カム４１とが前後方向に距
離Ｅ，Ｄ以上に移動せず、それらの段状カム面３３，４
３に給・排気弁１６のいずれの弁棒１７，１８も押し込
められず、その給・排気弁１６が閉じたままで、空気ば
ね５に対する給・排気が一切行われなず、この不感帯域
Ｂ，Ｃの範囲内では空気ばね５がシートクッションの上
下振動の緩衝を行う。At this time, if the vertical movement of the seat cushion is within the range of the dead zones B and C above and below the set reference height M, the air supply cam 31 and the exhaust cam 41 are separated by a distance E in the front-rear direction. The stepped cam surfaces 33, 4 do not move more than D
No valve rods 17 and 18 of the supply / exhaust valve 16 can be pushed into 3, and the supply / exhaust valve 16 remains closed, so that the air spring 5 is neither supplied nor exhausted. In the range of C, the air spring 5 cushions the vertical vibration of the seat cushion.
【００４１】ここで体重の重い人が座るなどして、シー
トクッションが設定基準高さＭから前述の不感帯域Ｃを
越えて下降すると、これに伴い給気用カム３１が図６の
状態から図７及び図８に示す如く後方向に所定距離Ｄ以
上移動し、この段状カム面３３の斜面部３３ｂを介し凸
面部３３ｃで給気弁の弁棒１７を押し込んで開弁させ
る。これで給気源からの圧縮空気が空気ばね５に供給さ
れ、この空気ばね５の内部作用圧が増加してアッパーフ
レーム２を押し上げ、シートクッションを上昇復帰させ
る。Here, when a heavy person sits down and the seat cushion descends from the set reference height M over the dead zone C, the air supply cam 31 changes from the state shown in FIG. As shown in FIGS. 7 and 8, the valve body 17 is moved backward by a predetermined distance D or more, and the valve rod 17 of the air supply valve is pushed in by the convex surface portion 33c through the inclined surface portion 33b of the stepped cam surface 33 to open the valve. As a result, compressed air from the air supply source is supplied to the air spring 5, the internal working pressure of the air spring 5 increases, pushes up the upper frame 2, and raises and restores the seat cushion.
【００４２】その給気弁の開弁後のシートクッションの
上昇復帰中には、図９に示す如く給気用カム３１の溝状
ガイド部３４で弁棒１７を押し込んだまま、給気弁を開
いた状態を維持しながら、該給気用カム３１が弁棒１７
に案内される如く少し上方に回動しながら前方向に復帰
移動する。その間、給気源から圧縮空気が空気ばね５に
供給し続けられる。そして、シートクッションが空気ば
ね５により押し上げられて設定基準高さＭまで上昇する
と、給気用カム３１の溝状ガイド部３４の後端から弁棒
１７が抜け外れて自己付勢力により突出動作し、これで
給気弁が閉じ、空気ばね５への圧縮空気の供給が止まっ
てシートクッションが元の設定基準高さＭに自動復帰し
て保持されると共に、給気用カム３１も図６に示す元と
の状態に復帰する。While the seat cushion is returning to its elevated position after the air supply valve is opened, the air supply valve is opened while the valve rod 17 is being pushed in by the groove-shaped guide portion 34 of the air supply cam 31 as shown in FIG. While maintaining the open state, the air supply cam 31 moves the valve rod 17
As it is guided to, it returns to the front while rotating a little upward. Meanwhile, the compressed air is continuously supplied to the air spring 5 from the air supply source. Then, when the seat cushion is pushed up by the air spring 5 and rises to the set reference height M, the valve rod 17 is disengaged from the rear end of the groove-shaped guide portion 34 of the air supply cam 31, and the seat cushion is projected by the self-urging force. Then, the air supply valve is closed, the supply of the compressed air to the air spring 5 is stopped, the seat cushion is automatically returned to the original set reference height M and is held, and the air supply cam 31 is also shown in FIG. It returns to the original state shown.
【００４３】逆に、シートクッションが設定基準高さＭ
から前述の不感帯域Ｂを越えて上昇すると、これに伴い
排気用カム４１が図６のから図１０及び図１１に示す如
く前方向に所定距離Ｅ以上移動し、この段状カム面４３
の斜面部４３ｂを介し凸面部４３ｃで排気弁の弁棒１８
を押し込んで開弁させる。これで空気ばね５内の圧縮空
気が排出され、この空気ばね５の内部作用圧が減少して
アッパーフレーム２と共にシートクッションが下降復帰
する。On the contrary, the seat cushion has a set reference height M.
When the exhaust cam 41 rises above the dead zone B, the exhaust cam 41 moves forward by a predetermined distance E or more as shown in FIGS.
The valve rod 18 of the exhaust valve is formed by the convex surface portion 43c through the inclined surface portion 43b.
Push in to open the valve. As a result, the compressed air in the air spring 5 is discharged, the internal working pressure of the air spring 5 is reduced, and the seat cushion is lowered and returned together with the upper frame 2.
【００４４】その排気弁の開弁後のシートクッションの
下降復帰中も、排気用カム４３の溝状ガイド部４４で弁
棒１８を押し込んだまま、排気弁を開いた状態を維持し
ながら、該排気用カム４１が後方向に復帰移動する。そ
の間、空気ばね５内の圧縮空気が排出し続けられる。そ
して、シートクッションが設定基準高さまで下降する
と、排気用カム４１の溝状ガイド部４４の前端から弁棒
１８が抜け外れて自己付勢力により突出動作し、これで
排気弁が閉じ、空気ばね５内からの排気が止まってシー
トクッションが元の設定基準高さＭに自動復帰して保持
されると共に、排気用カム４１も図６に示す元の状態に
復帰する。Even while the seat cushion is returning to the lowered position after the exhaust valve is opened, the valve rod 18 is pushed in by the groove-shaped guide portion 44 of the exhaust cam 43 while the exhaust valve is kept open. The exhaust cam 41 returns to the rearward direction. Meanwhile, the compressed air in the air spring 5 is continuously discharged. Then, when the seat cushion descends to the set reference height, the valve rod 18 comes off from the front end of the groove-shaped guide portion 44 of the exhaust cam 41, and the valve rod 18 projects by the self-urging force. The exhaust from inside stops, the seat cushion automatically returns to the original set reference height M and is held, and the exhaust cam 41 also returns to the original state shown in FIG.
【００４５】こうした構成の車両用シートのエアサスペ
ンション装置においては、弁切替機構３０として給気弁
と排気弁との各々専用の給気用カム３１と排気用カム４
１とを備えているので、その給気用カム３１と排気用カ
ム４１との各々の段状カム面３３，４３の長さをそれぞ
れ独自に選定することで、シートクッションが設定基準
高さＭから下降して給気用カム３１が給気弁を開く間で
の距離Ｄ（下方の不感帯域Ｃ）と、シートクッションが
設定基準高さＭから上昇して排気用カム４１が排気弁を
開く間での距離Ｅ（上方の不感帯域Ｂ）とを各々個々に
狭めたり広げたり自由に設定することが可能となる。し
かもその給気用カム３１と排気用カム４１との各々の段
状カム面３３，４３の長さＤ，Ｅ寸法を互いに異なる状
態に選定しても、その給気用カム３１と排気用カム４１
とは、いずれも給気弁或いは排気弁を一度開いた後、そ
の弁棒１７，１８を溝状ガイド部３４，４４で押し込ん
だまま開弁状態を維持しながら元の位置に復帰移動して
から閉弁動作させるので、何ら問題なくシートクッショ
ンを確実に設定基準高さＭに復帰保持できるようにな
る。In the vehicle seat air suspension apparatus having such a configuration, the valve switching mechanism 30 serves as the air supply cam 31 and the air exhaust cam 4 dedicated to the air supply valve and the exhaust valve, respectively.
1, the length of the stepped cam surfaces 33 and 43 of the air supply cam 31 and the exhaust cam 41 is independently selected, so that the seat cushion can set the reference height M. And the distance D (the lower dead zone C) between the air supply cam 31 and the air supply cam 31 opening the air supply valve, and the seat cushion rises from the set reference height M and the exhaust cam 41 opens the exhaust valve. It is possible to set the distance E (upper dead zone B) between them to be individually narrowed or widened. Moreover, even if the lengths D and E of the stepped cam surfaces 33 and 43 of the air supply cam 31 and the exhaust cam 41 are selected to be different from each other, the air supply cam 31 and the exhaust cam 41 are selected. 41
In either case, after opening the air supply valve or the exhaust valve once, the valve rods 17 and 18 are pushed back by the groove-shaped guide portions 34 and 44 and returned to the original position while maintaining the valve open state. Since the valve closing operation is performed from the above, the seat cushion can be reliably returned to and held at the set reference height M without any problem.
【００４６】このために、シートクッションの設定基準
高さＭから上方及び下方それぞれの不感帯域Ｂ，Ｃを、
狭すぎたり必要以上に広すぎたりしない範囲で、個々に
自由に設定することができて、シートクッションを着座
者の体重等にかかわらずシートクッションを常に効率良
く設定基準高さに復帰維持できると共に、車両の種類や
走行状態などの多種多様な諸条件或いは運転者の好み等
に応じ、それぞれ最適なクッション作用が得られるよう
に設定が可能で、走行振動による着座者の不快感や疲労
感を軽減できるようになる。また、図５に示した如くエ
アサスペンションの上下動高さと連結シャフトの前後動
変位が比例関係になくても、給気用カム３１と排気用カ
ム４１との各々の段状カム面３３，４３の長さＤ，Ｅ寸
法を選択することにより、シートクッションの設定基準
高さＭから上方及び下方それぞれの不感帯域Ｂ，Ｃを互
いに等しくすることも可能である。Therefore, the dead zones B and C above and below the set reference height M of the seat cushion are
The seat cushion can be freely set within a range that is neither too narrow nor wider than necessary, and the seat cushion can always be efficiently returned to and maintained at the set reference height regardless of the weight of the seated person. It is possible to set the optimum cushioning effect according to various conditions such as the type of vehicle and running condition, or the driver's preference. It can be reduced. Further, as shown in FIG. 5, even if the vertical movement height of the air suspension is not proportional to the longitudinal displacement of the connecting shaft, the stepped cam surfaces 33, 43 of the air supply cam 31 and the exhaust cam 41 are formed. It is also possible to make the dead zones B and C above and below the set reference height M of the seat cushion equal to each other by selecting the lengths D and E of the above.
【００４７】なお、本発明は前記実施例のみに限定され
ることなく、例えば給・排気弁１６を取付ける部材と、
弁切替機構３０の給気用カム３１と排気用カム４１を連
動させる部材とは、シートクッションの上下動に伴い相
対変位を生じるアッパーフレーム２やロアフレーム１や
リンク機構３のリンクバーなどのいずれか２つの部材を
適宜選択できる。その他、本発明の要旨を逸脱しない範
囲であれば種々変更可である。It should be noted that the present invention is not limited to the above-mentioned embodiment, and for example, a member to which the supply / exhaust valve 16 is attached,
The member for interlocking the air supply cam 31 and the exhaust cam 41 of the valve switching mechanism 30 is any one of the upper frame 2, the lower frame 1 and the link bar of the link mechanism 3 that undergo relative displacement as the seat cushion moves up and down. The two members can be appropriately selected. In addition, various modifications can be made without departing from the scope of the present invention.
【００４８】[0048]
【発明の効果】本発明の車両用シートのエアサスペンシ
ョン装置は、前述の如く構成したから、シートクッショ
ンの設定基準高さから上方及び下方それぞれの不感帯域
を、狭すぎたり必要以上に広すぎたりしない範囲で、個
々に自由に設定することができて、シートクッションを
着座者の体重等にかかわらずシートクッションを常に効
率良く設定基準高さに復帰維持できると共に、車両の種
類や走行状態などの多種多様な諸条件或いは運転者の好
み等に応じ、それぞれ最適なクッション作用が得られる
ように設定が可能で、走行振動による着座者の不快感や
疲労感の軽減に大いに役立つ効果が得られる。Since the air suspension device for a vehicle seat of the present invention is constructed as described above, the dead zones above and below the set reference height of the seat cushion are too narrow or unnecessarily wide. The seat cushion can be set freely within the range not to be set, and the seat cushion can always be efficiently returned to and maintained at the set reference height regardless of the weight of the seated person, and the type of the vehicle and the running condition of the seat cushion can be maintained. It is possible to set the optimum cushioning action according to various conditions or the driver's preference, and it is possible to greatly reduce the discomfort and fatigue of the occupant due to traveling vibration.
【図１】本発明の車両用シートのエアサスペンション装
置の一実施例を示す給・排気弁と弁切替機構との関係を
示す排気用カム前進移動時の要部斜視図。FIG. 1 is a perspective view of an essential part of an air suspension device for a vehicle according to an embodiment of the present invention, showing a relationship between a supply / exhaust valve and a valve switching mechanism when an exhaust cam is moved forward.
【図２】同上排気用カム後退復帰時の要部の斜視図。FIG. 2 is a perspective view of a main part when the exhaust cam retreats and returns.
【図３】同上実施例のエアサスペンション装置の略全体
の断面図。FIG. 3 is a cross-sectional view of the entire air suspension device of the embodiment.
【図４】同上実施例の給気用カムと排気用カムとの斜視
図。FIG. 4 is a perspective view of an air supply cam and an exhaust cam according to the embodiment.
【図５】同上実施例におけるエアサスペンション上下動
高さとリンク機構の連結シャフトの前後動変位との関係
曲線をグラフで示す図。FIG. 5 is a graph showing a relationship curve between the vertical movement height of the air suspension and the longitudinal displacement of the connecting shaft of the link mechanism in the embodiment.
【図６】（ａ）は同上実施例のシートクッションが設定
基準高さに位置する時の給・排気弁と給気用カム及び排
気用カムとの位置関係を示す平面図、（ｂ）は同側面
図。FIG. 6 (a) is a plan view showing the positional relationship between the air supply / exhaust valve, the air supply cam and the air exhaust cam when the seat cushion of the above embodiment is located at the set reference height, and FIG. The same side view.
【図７】（ａ）は同上実施例の給気用カムが後方に移動
して給気弁を開く寸前の平面図、（ｂ）は同側面図。FIG. 7 (a) is a plan view of the air supply cam of the above-described embodiment moving to the rear to open the air supply valve, and FIG. 7 (b) is a side view of the same.
【図８】（ａ）は同上実施例の給気用カムが後方に所定
距離以上移動して給気弁を開いた状態の平面図、（ｂ）
は同側面図。FIG. 8A is a plan view showing a state in which the air supply cam of the embodiment is moved backward by a predetermined distance or more and the air supply valve is opened, and FIG.
Is the same side view.
【図９】（ａ）は同上実施例の給気用カムが給気弁を開
いたまま前方に復帰移動している状態の平面図、（ｂ）
は同側面図。FIG. 9 (a) is a plan view showing a state in which the air supply cam of the above embodiment is moving forward while the air supply valve is open, and FIG.
Is the same side view.
【図１０】（ａ）は同上実施例の排気用カムが前方に移
動して排気弁を開く寸前の平面図、（ｂ）は（ａ）のＸ
−Ｘ線に沿う断面図。FIG. 10 (a) is a plan view of the exhaust cam of the above embodiment, which is on the verge of opening the exhaust valve by moving the exhaust cam forward, and FIG.
-A sectional view taken along the line X.
【図１１】（ａ）は同上実施例の排気用カムが前方に所
定距離以上移動して排気弁を開いた状態の平面図、
（ｂ）は（ａ）のＹ−Ｙ線に沿う断面図。FIG. 11 (a) is a plan view showing a state in which the exhaust cam of the embodiment is moved forward by a predetermined distance or more and the exhaust valve is opened.
(B) is sectional drawing which follows the YY line of (a).
【図１２】（ａ）は同上実施例の排気用カムが排気弁を
開いたまま後方に復帰移動している状態の平面図、
（ｂ）は（ａ）のＺ−Ｚ線に沿う断面図。FIG. 12 (a) is a plan view showing a state in which the exhaust cam of the above embodiment is returning and moving rearward with the exhaust valve open,
(B) is sectional drawing which follows the ZZ line of (a).
【図１３】従来例を示す車両用シートのエアサスペンシ
ョン装置の斜視図。FIG. 13 is a perspective view of an air suspension device for a vehicle seat showing a conventional example.
【図１４】同上従来例の給・排気弁と弁切替機構の関係
を示す拡大側面図。FIG. 14 is an enlarged side view showing the relationship between the supply / exhaust valve and the valve switching mechanism in the conventional example.
１…ロアフレーム、２…アッパーフレーム、３…リンク
機構、３ａ…連結シャフト、５…空気ばね、１６…給・
排気弁、１７，１８…弁棒、３０…弁切替機構、３１…
給気用カム、３３…段状カム面、３４…ガイド部、４１
…排気用カム、４３…段状カム面、４４…ガイド部、
Ｂ，Ｃ…不感帯域、Ｄ，Ｅ…所定距離、Ｍ…シートクッ
ション設定基準高さ。1 ... Lower frame, 2 ... Upper frame, 3 ... Link mechanism, 3a ... Connection shaft, 5 ... Air spring, 16 ... Supply
Exhaust valve, 17, 18 ... Valve rod, 30 ... Valve switching mechanism, 31 ...
Air supply cam, 33 ... Stepped cam surface, 34 ... Guide portion, 41
... Exhaust cam, 43 ... Stepped cam surface, 44 ... Guide part,
B, C ... Dead band, D, E ... Predetermined distance, M ... Seat cushion setting reference height.
Claims (1)
方に配され車両用シートのシートクッションを支持する
アッパーフレームと、前記ロアフレームに対しアッパー
フレームを上下動可能に支持するリンク機構と、前記ア
ッパーフレームに生じる荷重を支える空気ばねと、前記
空気ばねに給気源から給気させたり該空気ばね内部から
排気したりする常閉式の給・排気弁と、前記シートクッ
ションの上下動に連動して前記給・排気弁を選択的に開
く弁切替機構とを備え、この弁切替機構による給・排気
弁の開閉により空気ばね内圧を制御してシートクッショ
ンを設定基準高さに復帰せしめる車両用シートのエアサ
スペンション装置において、 前記弁切替機構は、前記シートクッションの上下動に伴
い前記給・排気弁を支持する部材と相対変位を生じる部
材に各々取付けた給気用カムと排気用カムとよりなり、
この給気用カムはシートクッションの設定基準高さから
の下降に伴い一方向に所定距離以上移動すると前記給気
弁の弁棒を押し込んで開弁させる段状カム面を有すると
共に、その開弁後は該段状カム面に隣接するガイド部で
弁棒を押し込んだままシートクッションが設定基準高さ
に上昇復帰するまで開弁状態を維持しながら他方向に復
帰移動する構成で、前記排気用カムはシートクッション
の設定基準高さからの上昇に伴い他方向に所定距離以上
移動すると前記排気弁の弁棒を押し込んで開弁させる段
状カム面を有すると共に、その開弁後は該段状カム面に
隣接するガイド部で弁棒を押し込んだままシートクッシ
ョンが設定基準高さに下降復帰するまで開弁状態を維持
しながら一方向に復帰移動する構成としたことを特徴と
する車両用シートのエアサスペンション装置。1. A lower frame, an upper frame which is arranged above the lower frame and supports a seat cushion of a vehicle seat, a link mechanism which supports the upper frame so as to be vertically movable with respect to the lower frame, and the upper. An air spring that supports the load generated in the frame, a normally closed supply / exhaust valve that causes the air spring to supply air from an air supply source, and exhausts air from the inside of the air spring. A seat for a vehicle that includes a valve switching mechanism that selectively opens the supply / exhaust valve, and that controls the internal pressure of the air spring by opening / closing the supply / exhaust valve by the valve switching mechanism to restore the seat cushion to a set reference height. In the air suspension device, the valve switching mechanism is displaced relative to a member supporting the supply / exhaust valve as the seat cushion moves up and down. Each More will supply air cam and the exhaust cam mounted occurring member,
This air supply cam has a stepped cam surface that pushes the valve rod of the air supply valve to open the valve when the seat cushion moves from the set reference height in one direction by a predetermined distance or more. After that, while the valve rod is pushed in by the guide portion adjacent to the stepped cam surface, the seat cushion rises to the set reference height and returns to the other direction while maintaining the valve open state. The cam has a stepped cam surface that pushes the valve rod of the exhaust valve to open the valve when the seat cushion moves from the set reference height in the other direction by a predetermined distance or more. A vehicle seat characterized in that the seat cushion is configured to move in one direction while maintaining the valve open state until the seat cushion descends and returns to the set reference height while the valve rod is pushed in by the guide portion adjacent to the cam surface. Air suspension system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4044632A JPH0757584B2 (en) | 1992-03-02 | 1992-03-02 | Vehicle seat air suspension system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4044632A JPH0757584B2 (en) | 1992-03-02 | 1992-03-02 | Vehicle seat air suspension system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05238299A true JPH05238299A (en) | 1993-09-17 |
| JPH0757584B2 JPH0757584B2 (en) | 1995-06-21 |
Family
ID=12696804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4044632A Expired - Fee Related JPH0757584B2 (en) | 1992-03-02 | 1992-03-02 | Vehicle seat air suspension system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0757584B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100845382B1 (en) | 2007-07-12 | 2008-07-09 | 명보기업 주식회사 | Air valve for driver's seat structure |
| CN104129322A (en) * | 2014-07-14 | 2014-11-05 | 长春富维—江森自控汽车饰件系统有限公司 | Precisely-adjusted air suspension mechanism integrated valve |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0427628A (en) * | 1990-05-23 | 1992-01-30 | Nanba Press Kogyo Kk | Vehicle seat air-suspension |
-
1992
- 1992-03-02 JP JP4044632A patent/JPH0757584B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0427628A (en) * | 1990-05-23 | 1992-01-30 | Nanba Press Kogyo Kk | Vehicle seat air-suspension |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100845382B1 (en) | 2007-07-12 | 2008-07-09 | 명보기업 주식회사 | Air valve for driver's seat structure |
| CN104129322A (en) * | 2014-07-14 | 2014-11-05 | 长春富维—江森自控汽车饰件系统有限公司 | Precisely-adjusted air suspension mechanism integrated valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0757584B2 (en) | 1995-06-21 |
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