JPH03292424A - Power transmission device - Google Patents
Power transmission deviceInfo
- Publication number
- JPH03292424A JPH03292424A JP31076889A JP31076889A JPH03292424A JP H03292424 A JPH03292424 A JP H03292424A JP 31076889 A JP31076889 A JP 31076889A JP 31076889 A JP31076889 A JP 31076889A JP H03292424 A JPH03292424 A JP H03292424A
- Authority
- JP
- Japan
- Prior art keywords
- working chamber
- case
- resistor
- plates
- sleeve
- 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
- 230000005540 biological transmission Effects 0.000 title claims abstract description 22
- 239000012530 fluid Substances 0.000 claims description 16
- 230000002093 peripheral effect Effects 0.000 abstract description 9
- 229920002545 silicone oil Polymers 0.000 abstract description 5
- 125000006850 spacer group Chemical group 0.000 abstract description 5
- 230000008878 coupling Effects 0.000 description 11
- 238000010168 coupling process Methods 0.000 description 11
- 238000005859 coupling reaction Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D35/00—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion
- F16D35/005—Fluid clutches in which the clutching is predominantly obtained by fluid adhesion with multiple lamellae
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arrangement And Driving Of Transmission Devices (AREA)
- Hydraulic Clutches, Magnetic Clutches, Fluid Clutches, And Fluid Joints (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
この発明は、例えば四輪駆動車に使用される動力伝達装
置に係り、さらに詳しくは、作動室内の抵抗板が受ける
粘性流体の粘性抵抗により動力を伝達する動力伝達装置
に関する。[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to a power transmission device used for example in a four-wheel drive vehicle, and more specifically relates to a power transmission device used in a four-wheel drive vehicle, and more specifically, to The present invention relates to a power transmission device that transmits power using viscous resistance of fluid.
（従来の技術）
従来のこの種の動力伝達装置としては、例えば特開昭５
８−５０３４９号公報に記載のいわゆるビスカスカップ
リング装置がある。このビスカスカップリング装置は、
作動室内に封入されたシリコンオイル等の粘性流体内で
ケース側、シャフト側にそれぞれ抵抗板が回転方向に係
合して交互に配設されたもので、ケース、シャフトと一
体に回転する複数の抵抗板が相対回転を起そうとすると
き、粘性流体の粘性抵抗によって動力を伝達するもので
ある。(Prior art) As a conventional power transmission device of this type, for example,
There is a so-called viscous coupling device described in Japanese Patent No. 8-50349. This viscous coupling device is
Resistance plates are arranged alternately on the case side and the shaft side in a viscous fluid such as silicone oil sealed in the operating chamber, engaging in the rotational direction. When the resistance plates attempt to cause relative rotation, power is transmitted through the viscous resistance of the viscous fluid.
（発明が解決しようとする課題）
上記のようなビスカスカップリング装置のトルク特性は
、作動室内に封入されるシリコンオイル等の粘性流体に
左右される。この粘性流体の粘度は、抵抗板間のジャレ
ート（速度勾配）によって変化するものである。(Problems to be Solved by the Invention) The torque characteristics of the viscous coupling device as described above depend on the viscous fluid, such as silicone oil, sealed in the working chamber. The viscosity of this viscous fluid changes depending on the jarate (velocity gradient) between the resistance plates.
第６図はジャレートに対する見掛は粘度の関係図であり
、粘度１０００ＩｌｌＩ２／Ｓかそれ以上のシリコンオ
イルは、ジャレートに応じて粘度が変化することを示し
ている。ここで、見掛けの粘度はある決められた量の液
を毛細管中を押し流すのに必要な圧力の関数として測定
される。FIG. 6 is a diagram showing the relationship between apparent viscosity and jarrate, and shows that the viscosity of silicone oil with a viscosity of 1000 IllI2/S or more changes depending on the jarrate. Here, apparent viscosity is measured as a function of the pressure required to force a given amount of liquid through a capillary tube.
ところで、ビスカスカップリング装置のトルク特性を向
上するために、各抵抗板間の間隙を小さくすることによ
り、粘性流体の粘性抵抗を高めることが考えられる。こ
の場合、従来のビスカスカップリング装置にあっては、
ケース側、シャフト側のそれぞれの抵抗板間の間隙が同
一に構成されているため、各抵抗板間の間隙を小さくす
ると、周速が速い外周部分におけるジャレートが増加し
、第６図に示すようにこのジャレートの増加によって粘
性流体の見掛けの粘度が低下するので、トルクアップが
阻害されトルク特性の向上に限界があった。By the way, in order to improve the torque characteristics of the viscous coupling device, it is conceivable to increase the viscous resistance of the viscous fluid by reducing the gap between each resistance plate. In this case, in the conventional viscous coupling device,
Since the gaps between the resistance plates on the case side and the shaft side are the same, if the gap between each resistance plate is made smaller, the jar rate will increase in the outer circumference where the circumferential speed is faster, as shown in Figure 6. This increase in jarrate lowers the apparent viscosity of the viscous fluid, which inhibits torque increase and limits the ability to improve torque characteristics.
そこでこの発明は、より一層のトルク特性の向上を図る
ことができる動力伝達装置の提供を目的とする。Therefore, an object of the present invention is to provide a power transmission device that can further improve torque characteristics.
［発明の構成コ
（課題を解決するための手段）
上記課題を解決するためにこの発明は、回転入力を受け
る第１回転体と、この第１回転体に相対回転可能に嵌合
された第２回転体と、前記第１回転体および第２回転体
間に形成され粘性流体を封入した作動室と、前記作動室
内において前記第１回転体と第２回転体とにそれぞれ回
転方向に係合して交互に配設された複数の抵抗板とを備
えてなる動力伝達装置において、前記両抵抗板間の隙間
を外周側が内周側よりも相対的に広くなるように形成す
る構成とした。[Configuration of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention includes a first rotating body that receives rotational input, and a first rotating body that is fitted to the first rotating body so as to be relatively rotatable. two rotary bodies, a working chamber formed between the first rotary body and the second rotary body and containing a viscous fluid, and engaged in the rotational direction with the first rotary body and the second rotary body, respectively, in the working chamber. In a power transmission device comprising a plurality of resistance plates arranged alternately, the gap between the resistance plates is formed such that the gap between the two resistance plates is relatively wider on the outer circumferential side than on the inner circumferential side.
（作用）
上記構成によれば、第１回転体側の抵抗板と第２回転体
側の抵抗板との間隙が、外周側へ向けて相対的に大きく
なっている。(Function) According to the above configuration, the gap between the resistance plate on the first rotating body side and the resistance plate on the second rotating body side becomes relatively larger toward the outer circumferential side.
このため、各抵抗板間の間隙を小さくした場合にも抵抗
板の外周側部分でのジャレートの増加が抑制され、これ
に伴って粘性流体の粘度の低下が抑制される。Therefore, even when the gap between each resistance plate is made small, an increase in the amount of jarate on the outer peripheral side of the resistance plate is suppressed, and a decrease in the viscosity of the viscous fluid is thereby suppressed.
（実施例） 以下、この発明の実施例を図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the drawings.
第１図はこの発明の一実施例に係る動力伝達装置の縦断
面図、第２図はこの発明に係る動力伝達装置を適用した
四輪駆動車全体を示す図である。FIG. 1 is a longitudinal sectional view of a power transmission device according to an embodiment of the present invention, and FIG. 2 is a diagram showing an entire four-wheel drive vehicle to which the power transmission device according to the present invention is applied.
第２図に示すように、エンジン１およびトランスミッシ
ョン３が車両の前部に横向きに配置されている。トラン
スミッション３からの出力は、トランスファ５を介して
一方では左右の前輪７に伝達され、また、他方ではビス
カスカップリング装Ｗ９およびプロペラシャフト１１を
介してファイナルドライブユニット１３に伝達され、さ
らに、ファイナルドライブユニット１３から左右の後輪
１５に伝達される。As shown in FIG. 2, an engine 1 and a transmission 3 are disposed laterally at the front of a vehicle. The output from the transmission 3 is transmitted to the left and right front wheels 7 via the transfer 5 on the one hand, and to the final drive unit 13 via the viscous coupling W9 and the propeller shaft 11 on the other hand. from there to the left and right rear wheels 15.
前記ビスカスカップリング装置９は、入力軸と出力軸と
の間にわずかな回転数差が生じた場合に、わずかなトル
クを伝達するという特性を有し、大きな回転数差に対し
て極めて大きなトルクを伝達する機能を有している。The viscous coupling device 9 has a characteristic of transmitting a small torque when a slight difference in rotational speed occurs between the input shaft and the output shaft, and transmits an extremely large torque for a large difference in rotational speed. It has the function of communicating.
このビスカスカップリング装置９は、第１図に示すよう
に、前記トランスファ５から延出された回転入力を受け
る第１回転体としての伝達軸１７（第１図では１部省略
）にスプライン１９により嵌挿されたスリーブ２１の外
周に、第２回転体としてのケース２３が相対回転可能に
嵌合され、前記スリ・−ブ２１とケース２３との間には
密閉状に形成された作動室２５が設けられている。ケー
ス２３は筒状の外筒２７の一端側にフランジ２９、他端
側に出力部３１が嵌合され、これらを溶接等の手段によ
り一体化して形成されている。そして、出力部３１には
フランジヨーク３３がボルト３５等によって連結され、
さらにプロペラシャフト１１が連結されている。As shown in FIG. 1, this viscous coupling device 9 has a spline 19 attached to a transmission shaft 17 (one part omitted in FIG. 1) as a first rotating body extending from the transfer 5 and receiving rotational input. A case 23 as a second rotating body is fitted to the outer periphery of the fitted sleeve 21 so as to be relatively rotatable, and an operating chamber 25 is formed in a sealed manner between the sleeve 21 and the case 23. is provided. The case 23 is formed by fitting a flange 29 to one end of a cylindrical outer cylinder 27 and an output portion 31 to the other end, and integrating these parts by means such as welding. A flange yoke 33 is connected to the output part 31 by bolts 35 or the like.
Furthermore, a propeller shaft 11 is connected.
ケース２３は伝達軸１７に一体的に嵌挿されたスリーブ
２１に対してフランジ２９と出力部３１とが軸受３７，
３９を介して回転自在に支持されている。ケース２３の
フランジ２９と出力部３１とには二ξリーブ２１に対し
てシール部材４１．４３が設けられている。そして、シ
ール部材４１゜４３によって作動室２５は密封形成され
、゛この作動室２５にはシリコンオイル等のような粘性
流体が封入されている。In the case 23, the flange 29 and the output part 31 are connected to the sleeve 21, which is integrally fitted onto the transmission shaft 17, and the bearing 37,
It is rotatably supported via 39. On the flange 29 of the case 23 and on the output part 31, sealing elements 41, 43 are provided for the two ξ ribs 21. The working chamber 25 is hermetically sealed by the seal members 41 and 43, and a viscous fluid such as silicone oil is sealed in the working chamber 25.
前記作動室２５内には、ケース２３の外筒２７の内周壁
に形成されたスプライン４５により回転方向に係合され
た複数の第１抵抗板４７と、スリーブ２１の外周に形成
されるスプライン４９により回転方向に係合された複数
の第２抵抗板５１とが交互に配設され、ケース２３側の
第１抵抗板４７間に所定間隔を保つための位置決めスペ
ーサリング５３がスリーブ２１側の第２抵抗板５１の外
周に接触しないように各第１抵抗板４７間に挿入されて
いる。なお、スペーサリング５３は内周側のみ、あるい
は双方に設けるようにすることもできる。Inside the working chamber 25, a plurality of first resistance plates 47 are engaged in the rotational direction by splines 45 formed on the inner peripheral wall of the outer cylinder 27 of the case 23, and a spline 49 formed on the outer periphery of the sleeve 21. A plurality of second resistance plates 51 engaged in the rotational direction are arranged alternately, and a positioning spacer ring 53 for maintaining a predetermined interval between the first resistance plates 47 on the case 23 side is arranged between the first resistance plates 51 on the sleeve 21 side. It is inserted between each first resistance plate 47 so as not to contact the outer periphery of the second resistance plate 51 . Note that the spacer ring 53 may be provided only on the inner peripheral side or on both sides.
第３図にその詳細を示すように、前記ケース２３側の第
１抵抗板４７は、均一な肉厚の薄板状に形成されており
、また、スリーブ２１側の第２抵抗板５１は、内周から
外周に向けて肉厚が連続的に薄くなるテーパ状に形成さ
れている。従って、ケース２３側の第１抵抗板４７とス
リーブ２１側の第２抵抗板５１との隙間は、スリーブ２
１側（内周側）からケース２３側（外周側）に向けて連
続的に大きくなっている。As shown in detail in FIG. 3, the first resistance plate 47 on the case 23 side is formed into a thin plate shape with a uniform thickness, and the second resistance plate 51 on the sleeve 21 side is It is formed in a tapered shape in which the wall thickness becomes thinner continuously from the periphery to the outer periphery. Therefore, the gap between the first resistance plate 47 on the case 23 side and the second resistance plate 51 on the sleeve 21 side is
The size increases continuously from the case 1 side (inner circumferential side) toward the case 23 side (outer circumferential side).
つぎに、上記一実施例の作用について説明する。Next, the operation of the above embodiment will be explained.
エンジン１の駆動力は、トランスミッション３によって
所定の変速を行われた後、トランスファ５を経て一方で
は前輪７に伝達され、また、他方ではビスカップリング
装置９、プロペラシャフト１１およびファイナルドライ
ブユニット１３を介して後輪１５に伝達される。After a predetermined speed change is performed by the transmission 3, the driving force of the engine 1 is transmitted to the front wheels 7 via the transfer 5 on the one hand, and via the screw coupling device 9, propeller shaft 11 and final drive unit 13 on the other hand. and is transmitted to the rear wheels 15.
トランスファ５の伝達軸１７からビスカスカップリング
装置９に伝達される回転力は、前記伝達軸１７にスプラ
イン１９により嵌挿されたスリーブ２１と一体的に回転
する第２抵抗板５１と、作動室２５内に封入された粘性
流体の粘性抵抗とから第１抵抗板４７に伝わり、第１抵
抗板４７と一体的に回転するケース２３に伝えられ、出
力部３１に連結されたフランジヨーク３３を介してプロ
ペラシャフト１１に伝送される。The rotational force transmitted from the transmission shaft 17 of the transfer 5 to the viscous coupling device 9 is transmitted to the second resistance plate 51 which rotates integrally with the sleeve 21 fitted to the transmission shaft 17 by a spline 19, and the working chamber 25. The viscous resistance of the viscous fluid sealed therein is transmitted to the first resistance plate 47, and is transmitted to the case 23, which rotates integrally with the first resistance plate 47, via the flange yoke 33 connected to the output part 31. The signal is transmitted to the propeller shaft 11.
ところで、上記ビスカスカップリング装置９は回転入力
を受けるスリーブ２１側の第２抵抗板５１が内周から外
周に向けて肉厚が連続的に薄くなるテーパ状に形成され
ており、ケース２３側の第１抵抗板４７との間隙がスリ
ーブ２１側からケース２３側に向けて連続的に大きくな
るように形成しているため、第１抵抗板４７と第２抵抗
板５１との間隙を小さくした場合でも、第２抵抗板５１
の外周部分のジャレート（速度勾配）の増加が従来例に
比較して小さくなり、これに伴って粘性流体の見掛は粘
度の変化が小さくなって、粘度の良好なジャレート範囲
を利用することができる。すなわち、内外周の見掛けの
粘度が同一になれば、この粘度が減少しないジャレート
ぎりぎりまで両紙抗板４７．５１を近接させることがで
きる。By the way, in the viscous coupling device 9, the second resistance plate 51 on the side of the sleeve 21 that receives rotational input is formed in a tapered shape whose wall thickness becomes thinner continuously from the inner circumference toward the outer circumference. Since the gap with the first resistance plate 47 is formed so as to continuously increase from the sleeve 21 side toward the case 23 side, when the gap between the first resistance plate 47 and the second resistance plate 51 is made small. However, the second resistance plate 51
The increase in the jarrate (velocity gradient) at the outer periphery of the fluid is smaller than in the conventional example, and as a result, the apparent change in viscosity of the viscous fluid becomes smaller, making it possible to utilize the good jarrate range of viscosity. can. That is, if the apparent viscosity of the inner and outer peripheries is the same, the two paper resistance plates 47 and 51 can be brought close to each other until the jarrate limit is reached where the viscosity does not decrease.
従って、同一容積の作動室２５で高トルクを得ることが
でき、さらに、トルク特性をリニア化することができる
（第４図参照）。Therefore, high torque can be obtained with the same volume of the working chamber 25, and furthermore, the torque characteristics can be made linear (see FIG. 4).
第５図はこの発明に係る他の実施例を示すもので、この
実施例は、スリーブ２１側に設ける第２抵抗板５５を、
２個の皿バネ形状のプレート５７を背中合せで組合せ、
内周から外周に向けて抵抗板４７との隙間が変化するよ
うにテーパ状に形成している。FIG. 5 shows another embodiment of the present invention, in which a second resistance plate 55 provided on the sleeve 21 side is
Two disc spring shaped plates 57 are combined back to back,
It is formed into a tapered shape so that the gap with the resistance plate 47 changes from the inner circumference to the outer circumference.
従って、この実施例でも、ケース２３側の第１抵抗板４
７とスリーブ２１側の第２抵抗板５５との間隙がスリー
ブ２１側からケース２３側に向けて連続的に大きくなる
ので、上記実施例と同様な効果を得ることができる。ま
た、抵抗板そのものは厚みの一定な板で形成でき、製造
が容易となる。Therefore, also in this embodiment, the first resistance plate 4 on the case 23 side
7 and the second resistance plate 55 on the sleeve 21 side becomes larger continuously from the sleeve 21 side toward the case 23 side, so the same effect as in the above embodiment can be obtained. Furthermore, the resistance plate itself can be formed of a plate with a constant thickness, making it easy to manufacture.
又、この実施例ではスペーサリング５３を用いずプレー
ト５７を内周側で当接させ、第２抵抗板５５を位置決め
してもよい。なお、スペーサリング５３は外周側のみ、
あるいは双方に設けることもできる。Further, in this embodiment, the second resistance plate 55 may be positioned by bringing the plate 57 into contact with the inner peripheral side without using the spacer ring 53. Note that the spacer ring 53 is only on the outer circumferential side.
Alternatively, it can be provided on both sides.
なお、この発明は抵抗板間の隙間に変化があればよいも
ので、抵抗板そのものの形状は限定されず、断面台形状
、翼形゛状等種々のものがある。又隙間も抵抗板の両側
で変化させる必要はなく片側でもよい。さらに、外周側
の抵抗板４７の形状を変えるようにすることもてきる
［発明の効果］
以上の説明より明らかなように、この発明の構成によれ
ば、各抵抗板間の間隙を小さくした場合でも、抵抗板の
外周側のジャレートの増加が抑制され、粘性流体の見掛
は粘度の低下が抑制される。Note that this invention only requires a change in the gap between the resistance plates, and the shape of the resistance plates themselves is not limited, and various shapes such as a trapezoidal cross section, an airfoil shape, etc. are available. Further, the gap does not need to be changed on both sides of the resistor plate, and may be on one side. Furthermore, the shape of the resistance plate 47 on the outer peripheral side can be changed. [Effects of the Invention] As is clear from the above explanation, according to the configuration of the present invention, the gap between each resistance plate can be reduced. Even in this case, an increase in the amount of jarrate on the outer peripheral side of the resistance plate is suppressed, and a decrease in the apparent viscosity of the viscous fluid is suppressed.
従って、粘度の良好なジャレート範囲を利用することが
できるため、同一容積の作動室で高トルクを得ることが
でき、さらに、トルク特性をリニア化することもできる
。Therefore, since it is possible to utilize a jarrate range with a good viscosity, high torque can be obtained with the same volume of the working chamber, and furthermore, the torque characteristics can be made linear.
第１図はこの発明の一実施例に係る動力伝達装置の断面
図、第２図はこの発明に係る動力伝達装置を適用した四
輪駆動車全体を示す図、第３図は要部拡大断面図、第４
図はトルク特性を示す図、第５図は他の実施例の要部拡
大断面図、第６図は粘性流体のジャレートに対する見掛
は粘度の関係を示す図である。
１７・・伝達軸
２１・・・スリーブ（第１回転体）
２３・・・ケース（第２回転体）
２５・・・作動室
４７・・・第１抵抗板
５１．５５・・・第２抵抗板FIG. 1 is a cross-sectional view of a power transmission device according to an embodiment of the present invention, FIG. 2 is a diagram showing the entire four-wheel drive vehicle to which the power transmission device according to the present invention is applied, and FIG. 3 is an enlarged cross-sectional view of main parts. Figure, 4th
FIG. 5 is an enlarged cross-sectional view of a main part of another embodiment, and FIG. 6 is a diagram showing the relationship between the apparent viscosity of viscous fluid and jarate. 17...Transmission shaft 21...Sleeve (first rotating body) 23...Case (second rotating body) 25...Working chamber 47...First resistance plate 51.55...Second resistance board
Claims (1)
回転可能に嵌合された第２回転体と、前記第１回転体お
よび第２回転体間に形成され粘性流体を封入した作動室
と、前記作動室内において前記第１回転体と第２回転体
とにそれぞれ回転方向に係合して交互に配設された複数
の抵抗板とを備えてなる動力伝達装置において、前記両
抵抗板間の隙間を外周側が内周側よりも相対的に広くな
るように形成したことを特徴とする動力伝達装置。A first rotating body that receives a rotational input, a second rotating body fitted to the first rotating body so as to be relatively rotatable, and a viscous fluid sealed between the first rotating body and the second rotating body. A power transmission device comprising: a chamber; and a plurality of resistance plates that are alternately arranged in engagement with the first rotary body and the second rotary body in the rotational direction in the working chamber, wherein both the resistors A power transmission device characterized in that the gap between the plates is formed so that the outer circumferential side is relatively wider than the inner circumferential side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31076889A JPH0650132B2 (en) | 1989-12-01 | 1989-12-01 | Power transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31076889A JPH0650132B2 (en) | 1989-12-01 | 1989-12-01 | Power transmission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03292424A true JPH03292424A (en) | 1991-12-24 |
| JPH0650132B2 JPH0650132B2 (en) | 1994-06-29 |
Family
ID=18009243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31076889A Expired - Fee Related JPH0650132B2 (en) | 1989-12-01 | 1989-12-01 | Power transmission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0650132B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4419232C1 (en) * | 1994-06-01 | 1996-01-11 | Gkn Viscodrive Gmbh | Visco:coupling in transmission train of vehicle |
-
1989
- 1989-12-01 JP JP31076889A patent/JPH0650132B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0650132B2 (en) | 1994-06-29 |
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