JPS6056617A - Suspension - Google Patents
SuspensionInfo
- Publication number
- JPS6056617A JPS6056617A JP58164380A JP16438083A JPS6056617A JP S6056617 A JPS6056617 A JP S6056617A JP 58164380 A JP58164380 A JP 58164380A JP 16438083 A JP16438083 A JP 16438083A JP S6056617 A JPS6056617 A JP S6056617A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- shock absorber
- oil
- accumulator
- hydraulic
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
- B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60G—VEHICLE SUSPENSION ARRANGEMENTS
- B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
- B60G17/02—Spring characteristics, e.g. mechanical springs and mechanical adjusting means
- B60G17/04—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics
- B60G17/0416—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics regulated by varying the resiliency of hydropneumatic suspensions
- B60G17/0424—Spring characteristics, e.g. mechanical springs and mechanical adjusting means fluid spring characteristics regulated by varying the resiliency of hydropneumatic suspensions by varying the air pressure of the accumulator
Abstract
Description
【発明の詳細な説明】
本発明は自動車等に於て、車体と車輪側間に介装されて
車体を懸架すると共に、車高を上げたり、下げたりでき
るハイドロニューマチイックサスペンションに関スル。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydropneumatic suspension that is interposed between the vehicle body and the wheel side of an automobile to suspend the vehicle body and to raise or lower the vehicle height.
この種従来のハイドロニューマチイックサスペンション
のシステムは、ショックアブソーバを切換バルブを介し
て油圧源に連通又は遮断させ、切換バルブとショックア
ブソーバ間にアキュームレータを連結し、ショックアブ
ソーバは自動車等の車体側と車輪側間に介在させたもの
が知られている。車高を上げる場合にはアキュ−ムレー
タとショックアブソーバ側にポンプから圧油を供給し、
アキュームレータの圧力を上昇させてショックアブソー
バを伸長させ、又車高を下げる場合にはショックアブソ
ーバ４・タンク側に接続し、アキュームレータσ）圧力
を下げることによりショックアブソーバを圧縮し、又切
換バルブを閉じている時にはアキュームレータに封じら
れた圧力下で車高を一定に保持し、車輪側からの振動等
はショックアブソーバで減衰するようになっている。This type of conventional hydropneumatic suspension system connects or shuts off the shock absorber to the hydraulic power source via a switching valve, connects an accumulator between the switching valve and the shock absorber, and connects the shock absorber to the vehicle body side of the vehicle. One is known that is interposed between the wheel sides. When raising the vehicle height, supply pressure oil from the pump to the accumulator and shock absorber side.
Increase the pressure of the accumulator to extend the shock absorber, and when lowering the vehicle height, connect the shock absorber 4 to the tank side, compress the shock absorber by lowering the pressure of the accumulator σ), and close the switching valve. When the vehicle is running, the vehicle height is held constant under the pressure sealed in the accumulator, and vibrations from the wheels are damped by shock absorbers.
しかして、上記のシステムでは、１．ＩＪ換バルブを介
して油圧源とショックアブソーバを通じさせた場合の作
動油は同じものが使用される。しかしながら、一般的に
は油圧源側將にポンプには潤滑性の良い油を使用する必
要があるため粘性の高い油を使用している。ところが、
この粘性の高い油を使用すると逆にショックアブソーバ
等のアクチュエータ側ではこの油が温度特性が悪い為に
配管抵抗が大きくなるという不具合が生ずる。むしろア
クチュエータ側では低粘度で温度特性の良いものを使用
するのが好ましいことになる。However, in the above system, 1. The same hydraulic fluid is used when the hydraulic power source and the shock absorber are communicated through the IJ exchange valve. However, in general, it is necessary to use oil with good lubricity for the pump on the side of the hydraulic power source, so oil with high viscosity is used. However,
If this highly viscous oil is used, on the other hand, the oil has poor temperature characteristics on the actuator side such as a shock absorber, resulting in a problem of increased piping resistance. Rather, it is preferable to use a material with low viscosity and good temperature characteristics on the actuator side.
従って本発明の目的は油圧源側の作動油とショックアブ
ソーバ側の作動油を分ＩＸ’ｆ して使用した自動車等
のハイドロニューマチイックサスペンションを提供する
ことである。Therefore, an object of the present invention is to provide a hydropneumatic suspension for automobiles, etc., which uses hydraulic oil on the hydraulic power source side and hydraulic oil on the shock absorber side separately.
本発明はこの目的達成８為、油圧源とショックアブソー
バを接続する回路の途中に二つの切換バルブを介在させ
、この二つの切換バルブの間の回路中にアキュームレー
タ、フリーピストン等の圧力伝達部材を介装させ、この
圧力伝達部材が油圧源とショックアブソーバ側の作動油
を分離すると共に油圧源側の圧力をショックアブソーバ
側に伝達させるようにしたことを特徴とするものである
。In order to achieve this object, the present invention interposes two switching valves in the middle of a circuit connecting a hydraulic power source and a shock absorber, and installs pressure transmitting members such as an accumulator and a free piston in the circuit between these two switching valves. This pressure transmitting member separates the hydraulic oil from the hydraulic pressure source and the shock absorber side, and transmits the pressure from the hydraulic source side to the shock absorber side.
以下本発明の実施の態様を図面について説明する。Embodiments of the present invention will be described below with reference to the drawings.
乏１１図の実施態様に係るサスペンションは圧力伝達部
材（１）として二つのアキュームレータ（２）（３）を
直接に接続したものである。The suspension according to the embodiment shown in FIG. 11 is one in which two accumulators (2) and (3) are directly connected as a pressure transmission member (1).
即ち油圧源たる油圧ポンプ（４）とタンク（５）は回路
（６）（７１を介して二つの上下ポジションを有するオ
ニのソレノイド切換バルブ（８）と接続し、同じく切換
バルブ（８）は回路（９）を介して一方のアキュームレ
ータの油室（２α）に接続され、回路（（３） （７１
（！’）１が油圧源側の配管を構成している。尚回路（
６）とタンク（５）間には分岐回路００）が設けられ、
この回路中にリリーフバルブ（１１１が介装されている
。That is, the hydraulic pump (4) and tank (5), which are the hydraulic power sources, are connected to the oni solenoid switching valve (8) having two upper and lower positions via the circuit (6) (71), and the switching valve (8) is also connected to the circuit (6) (71). (9) is connected to the oil chamber (2α) of one accumulator, and the circuit ((3) (71
(!') 1 constitutes the piping on the hydraulic power source side. Furthermore, the circuit (
A branch circuit 00) is provided between the tank (5) and the tank (5),
A relief valve (111) is installed in this circuit.
油圧ポンプ（４）はモータ（１２１で駆動され、切換バ
ルブ（８）はソレノイド（８α）に信号を送ってＩｊｋ
隔的に切換操作するものであるが、手動操作でＬｕＪ換
えても使用可能である。The hydraulic pump (4) is driven by a motor (121), and the switching valve (8) sends a signal to the solenoid (8α) to
Although the switching operation is performed at intervals, it can also be used by manually switching LuJ.
他方自動車等の車体と車輪側間に介装されて車体を懸架
すると共に車高を上げ下げするアクチュエータたるショ
ックアブソーバ（１３）は四輪数に応じて例えば四本設
けられている。このショックアブソーバ（１３）は回路
（＋４１を介して１１２のソレノイド切換バルブ（Ｉ６
）に接続され、回路（１４）から分岐した回路にはアキ
ュームレータα力が接続され、又切換バルブ（１６＋は
回路αυを介してアキュームレ−夕（３）ノ油室（３α
）ニ接続され、回路０４１ （１，５） Ｑａｌがショ
ックアブソーバ側の配管を構成している。On the other hand, shock absorbers (13), which are actuators that are interposed between the vehicle body and the wheels of an automobile or the like to suspend the vehicle body and raise and lower the vehicle height, are provided, for example, in four pieces depending on the number of four wheels. This shock absorber (13) is connected to the solenoid switching valve (I6) of 112 via the circuit (+41).
), and the accumulator α force is connected to a circuit branched from the circuit (14), and the switching valve (16+ is connected to the oil chamber (3α) of the accumulator (3) via the circuit αυ.
) is connected, and the circuit 041 (1, 5) Qal constitutes the piping on the shock absorber side.
圧力伝達部材たる二つのアキュームレータ（３）（３）
のガス室（２（Ｚ）（３α）は回路（１ωを介して相互
に通じている。Two accumulators (3) (3) as pressure transmitting members
The gas chambers (2(Z) (3α) of the gas chambers (2(Z)) (3α) communicate with each other via the circuit (1ω).
次に作動について述べる。Next, we will discuss the operation.
牙１図の状態はポンプ（４）が停止し、ショックアブソ
ーバ（１３）が切換バルブ（１Ｇ）で油圧源と遮断され
ているところを示すものである。この状態では車体がシ
ョックアブソーバａ３１とアキュームレータα力で懸架
されており、一定の高さで保持され、車両の走行中に振
動等があった時この振動等の衝撃エネルギーはショック
アブソーバ（１３１で吸収緩和される。The state shown in Figure 1 shows the pump (4) stopped and the shock absorber (13) cut off from the hydraulic power source by the switching valve (1G). In this state, the vehicle body is suspended by the shock absorber a31 and the accumulator α force, and is held at a constant height, and when there is vibration etc. while the vehicle is running, the impact energy of this vibration etc. is absorbed by the shock absorber (131). eased.
一方車高を上げたい場合には、ソレノイド切換バルブ（
８） （１Ｇ＋をそれぞれ図に於て上側ポジションに切
換えると共にモータ（１２）を介してポンプ（４）を作
動させる。この時ポンプ（４）の圧油が回路（６）−切
換バルブ（８）−回路（９）を介して左側アキュームレ
ータ（２）の油室（２α）に導かれる。この為、この油
室（２ａ）の油量が増加し他方のカス’Ｍ （２ｈ）を
圧縮して内圧を上昇させる。この上昇した圧力は回路（
１９１を介して右側アキュームレータ（３）のガス室（
３６）に導かれ、このガス室（３ｂ）を拡大すると共に
内圧を上昇させる。この為カス室（３６）の内圧で他方
の油室（３ａ）が圧縮され、その内部の油が回路（１８
１−切換バルブ（１６）の上側ポジション−回路（Ｉ４
）−回路（１５１を介してアキュームレータ（１７）の
油室に導かれる。この時アキュームし一部のガス室が圧
縮しガス圧が上昇する為、この圧力により作動油が回路
（１４１よりショックアブソーバ（１３１の下方油室に
導かれてこれを上昇する。Ｉ；（ｌって車高がアップす
る。On the other hand, if you want to raise the vehicle height, use the solenoid switching valve (
8) (Switch 1G+ to the upper position in the figure and operate the pump (4) via the motor (12). At this time, the pressure oil of the pump (4) is transferred to the circuit (6) - switching valve (8) - It is guided to the oil chamber (2α) of the left accumulator (2) via the circuit (9). Therefore, the amount of oil in this oil chamber (2a) increases and compresses the other cass'M (2h). Increases the internal pressure. This increased pressure causes the circuit (
191 to the gas chamber (
36) to expand this gas chamber (3b) and increase the internal pressure. For this reason, the other oil chamber (3a) is compressed by the internal pressure of the waste chamber (36), and the oil inside the oil chamber (36) is compressed by the internal pressure of the waste chamber (36).
1 - Upper position of switching valve (16) - Circuit (I4
)-circuit (151) to the oil chamber of the accumulator (17). At this time, it accumulates and compresses some of the gas chambers, increasing the gas pressure. This pressure causes the hydraulic oil to flow from the circuit (141 to the shock absorber (It is guided to the lower oil chamber 131 and raised. I; (l means the vehicle height increases.
他方車高を下げる場合には、一方の切換バルブ（８）を
下側ポジションに切換え、他方の切換バルブ０６）を上
側ポジションに切換える。この１１．５圧力伝達部材（
１）における左側アキューム１ノータ（２）の油室（２
α）の圧油が回路（９）−切換バルブ（８）−回路（７
）を介してタンク（５）に戻される為アキュームレータ
（２）のガス室（２ｈ）のガス圧が低下する。従つて他
方のアキュームレータ（３）のカス室（３ｈ）の低下し
、油室（３ａ）の内圧が下がり、拡大可能となる。この
為アキュームレータ（Ｉ７）のガス室及び油室の内圧が
下がり、ショックアブソーバ０３）は自重で下降すると
共に油室の作動油が回路（１４）よりアキュームレータ
（３） （＋７１１１１ｔｌに戻される。On the other hand, when lowering the vehicle height, one switching valve (8) is switched to the lower position, and the other switching valve (06) is switched to the upper position. This 11.5 pressure transmission member (
1) Oil chamber (2) of the left accumulation 1 node (2)
α) Pressure oil flows through circuit (9) - switching valve (8) - circuit (7).
), the gas pressure in the gas chamber (2h) of the accumulator (2) decreases. Therefore, the waste chamber (3h) of the other accumulator (3) is lowered, the internal pressure of the oil chamber (3a) is lowered, and the oil chamber (3a) can be expanded. For this reason, the internal pressure in the gas chamber and oil chamber of the accumulator (I7) decreases, and the shock absorber 03) descends under its own weight, and the hydraulic oil in the oil chamber is returned to the accumulator (3) (+71111tl) from the circuit (14).
上記の回路システムでは、油圧源側の配管（６）（７）
（９＋とショックアブソーバ側力配管Ｑ４１ （１５）
θ８）とは二つのアキュームレータ（２＋ （３）で分
離されているから品質の異なる作動油を使用でき、特に
油圧源側では高粘度で温度特性の悪いものが使用でき、
ショックアブソーバ側では低粘度で温度特性の良いもの
を使用することがＩ’ｉＴ能である。In the above circuit system, the piping (6) (7) on the hydraulic power source side
(9+ and shock absorber side force piping Q41 (15)
θ8) is separated by two accumulators (2+ (3), so hydraulic fluids of different quality can be used, especially on the hydraulic source side, high viscosity and poor temperature characteristics can be used.
On the shock absorber side, it is best to use one with low viscosity and good temperature characteristics.
】・２図、刈・３図は圧力伝達部拐の他の実施態様に係
るものである。即ち牙２図はカス室（２０（Ｚ）を中央
に形成し、その両側に油室（２０Ａ） （２０ｂ）をニ
ー７）区画Ｌ、各油室（２ｏｚ）（２０ｈ）を回路（９
） （１８１に接続したものである。】・Figures 2 and 3 relate to other embodiments of the pressure transmission unit. In other words, Fang 2 has a waste chamber (20 (Z)) in the center, oil chambers (20A) (20b) on both sides of the knee 7) section L, and each oil chamber (2oz) (20h) as a circuit (9).
) (Connected to 181.
又牙３図はフリーピストン（２２）を内蔵したシリンダ
（２１）を使用したものであり、シリンダ（２１）内に
フリーピストン（２２］が左右二つの油室（２３１（２
４＋を区画し、一方の油室（２３）を回路（９）に接続
し、他力の油室ｔ２４）を回路（１８１に接続したもの
である。この場合一方の油室（２３＋に圧油を供給する
とフリーピストン（２２）が右行し、他方の油室０４１
の作動油をショックアブソーバ側に押し出すものである
。In addition, Fig. 3 uses a cylinder (21) with a built-in free piston (22), and the free piston (22) is located inside the cylinder (21) with two left and right oil chambers (231 (2)).
4+ is divided, one oil chamber (23) is connected to the circuit (9), and the external oil chamber t24) is connected to the circuit (181).In this case, one oil chamber (23+) is connected to the circuit (181). When supplied, the free piston (22) moves to the right, and the other oil chamber 041
The hydraulic oil is pushed out to the shock absorber side.
】・２図、４７３図の場合にも作児Ｊは】・１図の場合
と同じであり、二つの配管中に異なった品質の作動油を
供給できるようにした効果も同じである。]・Sakuji J is the same as in the case of FIG. 2 and 473, and the effect of being able to supply hydraulic oil of different quality into the two pipes is also the same.
以上のように本発明は油圧源とショックアブソーバ側の
作動油を圧力伝達部拐を介して分離したから、油圧源に
粘度の高い油を使用でき、ショックアブソーバ側に粘度
の低い油を９２用でき、こり、 Ｋより油圧源では潤滑
性が良く、ショックアブソーバ側では配管抵抗を小さく
することができるものである。As described above, since the present invention separates the hydraulic oil on the hydraulic power source and the shock absorber side through the pressure transmission part, it is possible to use oil with high viscosity in the hydraulic source, and oil with low viscosity on the shock absorber side. It has better lubricity with a hydraulic source than K, and can reduce piping resistance on the shock absorber side.
、１−１図は本発明の実施の一態様に係るサスペンショ
ンの油圧回路図、】１２図、】１３図は他の圧力伝達部
材を使用した他の実施態様に係るサスペンションの一部
油圧回路図である。
（１）・・・圧力伝達部材、（２１（３）・・・アキュ
ームレータ、（２ａ）（３ａ） １・油室、（２Ａ）（
３ｉ・争・ガス室、（４）（５）・・・油圧源、（６）
（７） （９） １４１ （１５１０８１・・・回路
、（８） （１Ｇ＋・・・切換バルブ、（１３＋・・・
ショックアブソーバ、ａη・・・アキュームレータ、
繻争、（’２０）−”ガス室、（２０ｈ）・・・油室、
（２１）・・・シリンダ、（２２＋・・・フリーピスト
ン、 （２３）［２４）−・・油室。
代理人弁理士
天 野 泉, 1-1 is a hydraulic circuit diagram of a suspension according to one embodiment of the present invention, FIGS. 12 and 13 are partial hydraulic circuit diagrams of a suspension according to other embodiments using other pressure transmission members. It is. (1)...Pressure transmission member, (21(3)...Accumulator, (2a) (3a) 1. Oil chamber, (2A) (
3i・War・Gas chamber, (4) (5)...Hydraulic source, (6)
(7) (9) 141 (151081...Circuit, (8) (1G+...Switching valve, (13+...
Shock absorber, aη...accumulator, dispute, ('20)-"gas chamber, (20h)...oil chamber,
(21)...Cylinder, (22+...Free piston, (23) [24)-...Oil chamber. Representative Patent Attorney Izumi Amano
Claims (1)
路の途中８τ矛１の油圧源側切換バルブと３・２のショ
ックアブソーバ側切換バルブとを設け、牙２の切換バル
ブとショックアブソーバ間の回路中にアキュームレータ
を結合り、、；１−１ 、．４−２切換バルブ間の回路
中には圧力１人達部材を介在させたサスペンション。 （２）圧力伝達部材が二つのアキュームレータからなり
、各アキュームレータのガス幸な相〃に通じさせると共
に一方のアキュームレータの油室を油圧側回路に接続し
、他方のアキュ−ムレータの油室をショックアブソーバ
側回路に接続した特許請求の範囲牙１項記載のサスペン
ション。 （３） 圧力伝達部材がアキューム１ノータから１、［
す、当該アキュームレータはガス宰の両側に油室を設け
たものからなる特許請求の範囲オ・１項記載のサスペン
ション。 （４） 圧力伝達部材がシリンダとこのシリンダ内に摺
動自在に挿入したフリーピストンとからなり、フリーピ
ストンで゛区画された二つの油室なそれぞれ油圧側回路
とショックアブソーバ側回路とに接続り一だ特許請求の
範囲２１１項記載のサスペンション。[Claims] (11) A hydraulic power source side switching valve 1 and a shock absorber side switching valve 3 and 2 are provided in the middle of the circuit connecting the hydraulic power source and the shock absorber. A suspension in which an accumulator is connected in the circuit between the valve and the shock absorber, and a pressure transmitting member is interposed in the circuit between the switching valves. The patent claim consists of two accumulators, each accumulator is connected to the gas phase, and the oil chamber of one accumulator is connected to the hydraulic pressure side circuit, and the oil chamber of the other accumulator is connected to the shock absorber side circuit. Suspension according to range 1 item 1. (3) The pressure transmitting member is from the accumulator 1 to 1, [
2. The suspension according to claim 1, wherein the accumulator has oil chambers on both sides of the gas chamber. (4) The pressure transmission member consists of a cylinder and a free piston slidably inserted into the cylinder, and is connected to the hydraulic side circuit and the shock absorber side circuit, respectively, which are two oil chambers partitioned by the free piston. The suspension according to claim 211.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58164380A JPS6056617A (en) | 1983-09-07 | 1983-09-07 | Suspension |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58164380A JPS6056617A (en) | 1983-09-07 | 1983-09-07 | Suspension |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6056617A true JPS6056617A (en) | 1985-04-02 |
| JPH0365283B2 JPH0365283B2 (en) | 1991-10-11 |
Family
ID=15792022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58164380A Granted JPS6056617A (en) | 1983-09-07 | 1983-09-07 | Suspension |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6056617A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6361309U (en) * | 1986-10-13 | 1988-04-23 | ||
| WO2000002743A1 (en) * | 1998-07-08 | 2000-01-20 | Hydac Technology Gmbh | Pressure regulating system |
| EP1056609A1 (en) * | 1998-01-27 | 2000-12-06 | Atlas Copco Wagner, Inc. | Roll-resistant hydraulic suspension system, kit and method for load handling vehicles |
| EP2703651A3 (en) * | 2012-08-28 | 2018-03-07 | Hydac Technology Gmbh | Pressure accumulator assembly and device with such a pressure accumulator assembly |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59171709A (en) * | 1983-03-15 | 1984-09-28 | Nhk Spring Co Ltd | Vehicle height adjuster |
-
1983
- 1983-09-07 JP JP58164380A patent/JPS6056617A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59171709A (en) * | 1983-03-15 | 1984-09-28 | Nhk Spring Co Ltd | Vehicle height adjuster |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6361309U (en) * | 1986-10-13 | 1988-04-23 | ||
| EP1056609A1 (en) * | 1998-01-27 | 2000-12-06 | Atlas Copco Wagner, Inc. | Roll-resistant hydraulic suspension system, kit and method for load handling vehicles |
| EP1056609A4 (en) * | 1998-01-27 | 2006-06-14 | Atlas Copco Wagner Inc | Roll-resistant hydraulic suspension system, kit and method for load handling vehicles |
| WO2000002743A1 (en) * | 1998-07-08 | 2000-01-20 | Hydac Technology Gmbh | Pressure regulating system |
| EP2703651A3 (en) * | 2012-08-28 | 2018-03-07 | Hydac Technology Gmbh | Pressure accumulator assembly and device with such a pressure accumulator assembly |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0365283B2 (en) | 1991-10-11 |
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