JPH08105366A - Engine - Google Patents

Engine

Info

Publication number
JPH08105366A
JPH08105366A JP27040994A JP27040994A JPH08105366A JP H08105366 A JPH08105366 A JP H08105366A JP 27040994 A JP27040994 A JP 27040994A JP 27040994 A JP27040994 A JP 27040994A JP H08105366 A JPH08105366 A JP H08105366A
Authority
JP
Japan
Prior art keywords
fuel injection
rocker arm
groove
injection pipe
cylinder head
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
Application number
JP27040994A
Other languages
Japanese (ja)
Other versions
JP2939966B2 (en
Inventor
Akihiro Mori
聡宏 森
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Priority to JP6270409A priority Critical patent/JP2939966B2/en
Publication of JPH08105366A publication Critical patent/JPH08105366A/en
Application granted granted Critical
Publication of JP2939966B2 publication Critical patent/JP2939966B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/06—Aluminous cements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

PURPOSE: To reduce the height of a fuel injection tube to be arranged to the upper part of a rocker arm for an intake valve in a rocker arm type engine provided with a fuel injection nozzle. CONSTITUTION: Two intake valves 2 and two exhaust valves 3 per cylinder are fitted to a cylinder head 4 of a DOHC engine, a fuel injection nozzle 1 is fixed to the cylinder head 4 so as to be surrounded by the intake valves 2 and the exhaust valves 3, a groove 24 is formed in the upper surface of a rocker arm 21 for the approximately Y-shaped intake valves, and a fuel injection tube 25 to be connected to the fuel injection nozzle 1 is arranged in the groove 24.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、ロッカアーム式エンジ
ン、とくに、ロッカアーム式ディーゼルエンジンにおけ
る燃料噴射管の配置構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rocker arm type engine, and more particularly to a fuel injection pipe arrangement structure in a rocker arm type diesel engine.

【０００２】[0002]

【従来の技術】従来のロッカアーム式ダブルオーバーヘ
ッドカムシャフト（ＤＯＨＣ）ディーゼルエンジンにお
いては、図５に例示されているように、燃料噴射ノズル
１が２本の吸気弁２と２本の排気弁３とに囲まれて、各
シリンダの略中央に相当する位置でシリンダヘッド４に
固定され、先端が二股に分岐した吸気弁用ロッカアーム
５がロッカシャフト６に枢支されてロッカスプリング７
により付勢されると共に、シリンダヘッド４上のカムシ
ャフト８のカムにより駆動されて揺動し、その各先端で
それぞれ吸気弁２の頭部を押圧して開閉し、また、先端
が二股に分岐した排気弁用ロッカアーム９がロッカシャ
フト１０に枢支されてロッカスプリング１１により付勢
されると共に、シリンダヘッド４上のカムシャフト１２
のカムにより駆動されて揺動し、その各先端でそれぞれ
排気弁３の頭部を押圧して開閉し、さらに、図示しない
燃料ポンプと燃料噴射ノズル１とを接続する燃料噴射管
１３が、両ロッカアーム５、９等を覆うロッカカバー１
４内において、吸気弁用ロッカアーム５の上方に配置さ
れている。2. Description of the Related Art In a conventional rocker arm type double overhead camshaft (DOHC) diesel engine, a fuel injection nozzle 1 has two intake valves 2 and two exhaust valves 3 as shown in FIG. The intake valve rocker arm 5 is fixed to the cylinder head 4 at a position corresponding to approximately the center of each cylinder and is bifurcated at the tip.
Is driven by the cam of the cam shaft 8 on the cylinder head 4 and swings, and the heads of the intake valves 2 are pressed and opened and closed by their respective tips, and the tips are bifurcated. The exhaust valve rocker arm 9 is pivotally supported by the rocker shaft 10 and is urged by the rocker spring 11, and the camshaft 12 on the cylinder head 4 is
Is driven by the cam of the exhaust valve 3 to swing, and the head of the exhaust valve 3 is pressed by each of its ends to open and close. Furthermore, the fuel injection pipe 13 connecting the fuel pump (not shown) and the fuel injection nozzle 1 is Rocker cover 1 for covering the rocker arms 5, 9 etc.
4 is disposed above the intake valve rocker arm 5.

【０００３】しかしながら、この場合には、ロッカシャ
フト６上を揺動する吸気弁用ロッカアーム５に燃料噴射
管１３が干渉しないように、吸気弁用ロッカアーム５の
上方を大きく迂回させて燃料噴射管１３を配設する必要
があるので、燃料噴射管１３の配設構造が複雑化すると
同時に、燃料噴射管１３が必然的に長くなって、高圧燃
料噴射エンジンにおいては不利となる一方、燃料噴射管
１３が高く配置されるために、シリンダヘッド４の高さ
増加によるエンジン全高の増大を招き、とくに車両用エ
ンジンとして不具合であった。However, in this case, the fuel injection pipe 13 is largely bypassed above the intake valve rocker arm 5 so that the fuel injection pipe 13 does not interfere with the intake valve rocker arm 5 swinging on the rocker shaft 6. Since it is necessary to dispose the fuel injection pipe 13, the arrangement structure of the fuel injection pipe 13 becomes complicated, and at the same time, the fuel injection pipe 13 becomes inevitably long, which is disadvantageous in the high-pressure fuel injection engine. Since the height of the cylinder head 4 is increased, the overall height of the engine is increased due to the increase of the height of the cylinder head 4, which is a problem especially as a vehicle engine.

【０００４】[0004]

【発明が解決しようとする課題】本発明の目的は、燃料
噴射ノズルをそなえたロッカアーム式エンジンにおい
て、吸気弁用ロッカアームの上方に配置される燃料噴射
管の高さを低く押さえることができるようにしようとす
ることにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a rocker arm type engine having a fuel injection nozzle so that the height of a fuel injection pipe arranged above an intake valve rocker arm can be kept low. To try.

【０００５】[0005]

【課題を解決するための手段】この目的を達成するた
め、本発明にかかるエンジンは、シリンダヘッドに取り
付けられた吸気弁、ロッカシャフトに枢支されてシリン
ダの略半径方向に沿って延びカムシャフトにより揺動さ
せられて上記吸気弁を開閉するロッカアーム、上記吸気
弁より上記シリンダの中央寄りに配置され上記シリンダ
ヘッドに固定された燃料噴射ノズル及び同燃料噴射ノズ
ルに接続された燃料噴射管を有し、上記ロッカアームの
上面には上記略半径方向に沿って延びる溝が形成され、
上記燃料噴射管の少なくとも一部が上記溝内に配置され
ている。To achieve this object, an engine according to the present invention comprises an intake valve mounted on a cylinder head and a camshaft pivotally supported by a rocker shaft and extending substantially in the radial direction of the cylinder. A rocker arm that opens and closes the intake valve by being rocked by a fuel injection nozzle fixed to the cylinder head and closer to the center of the cylinder than the intake valve; and a fuel injection pipe connected to the fuel injection nozzle. However, a groove extending along the substantially radial direction is formed on the upper surface of the rocker arm,
At least a part of the fuel injection pipe is arranged in the groove.

【０００６】[0006]

【作用】すなわち、ロッカアームの上面に形成されてシ
リンダの略半径方向に沿って延びる溝内に、燃料噴射ノ
ズルに接続された燃料噴射管の少なくとも一部が配置さ
れているので、ロッカアームの上方に燃料噴射管が配置
された従来装置と比較して、燃料噴射管を容易に低い位
置に配設することができ、従って、燃料噴射管の長さを
比較的小さくすることができると同時に、エンジンの全
高を簡単に低く抑制することができる。In other words, since at least a part of the fuel injection pipe connected to the fuel injection nozzle is arranged in the groove formed on the upper surface of the rocker arm and extending substantially in the radial direction of the cylinder, it is located above the rocker arm. Compared with the conventional device in which the fuel injection pipe is arranged, the fuel injection pipe can be easily arranged at a lower position, and therefore, the length of the fuel injection pipe can be made relatively small, and at the same time, the engine can be reduced. The overall height of can be easily controlled to be low.

【０００７】[0007]

【実施例】以下、本発明の実施例について、前記従来装
置と同等部分には同一符号を付けて説明する。図１及び
図２において、ロッカアーム式ＤＯＨＣディーゼルエン
ジンの各シリンダ２０毎に２本の吸気弁２と２本の排気
弁３とがシリンダヘッド４に取り付けられ、シリンダ２
０毎の各燃料噴射ノズル１は計４本の吸気弁２及び排気
弁３に囲まれて、各シリンダ２０の略中央に相当する位
置でシリンダヘッド４に固定されている一方、先端が二
股に分岐した略Ｙ字状の吸気弁用ロッカアーム２１はロ
ッカシャフト６に枢支されてシリンダ２０の略半径方向
に沿って延び、ロッカスプリング７により付勢されると
共に、シリンダヘッド４上に設けられたカムシャフト８
のカムにより駆動されて揺動し、その各先端でそれぞれ
吸気弁２の頭部を同時に押圧して開閉し、また、先端が
二股に分岐した略Ｙ字状の排気弁用ロッカアーム９は同
様にシリンダ２０の略半径方向に沿って延び、ロッカシ
ャフト１０に枢支されてロッカスプリング１１により付
勢されると共に、シリンダヘッド４上に設けられたカム
シャフト１２のカムにより駆動されて揺動し、その各先
端でそれぞれ排気弁３の頭部を同時に押圧して開閉する
ように構成されている。Embodiments of the present invention will be described below by assigning the same reference numerals to the parts equivalent to those of the conventional device. 1 and 2, two intake valves 2 and two exhaust valves 3 are attached to a cylinder head 4 for each cylinder 20 of a rocker arm type DOHC diesel engine.
Each zero fuel injection nozzle 1 is surrounded by a total of four intake valves 2 and exhaust valves 3 and is fixed to the cylinder head 4 at a position corresponding to approximately the center of each cylinder 20, while the tip is bifurcated. The branched Y-shaped intake valve rocker arm 21 is pivotally supported by the rocker shaft 6 and extends substantially in the radial direction of the cylinder 20, is biased by the rocker spring 7, and is provided on the cylinder head 4. Camshaft 8
The rocker arm 9 for the exhaust valve, which is substantially Y-shaped with its tip bifurcated, is similarly driven by the cam of the above-mentioned cam and swings to simultaneously open and close the head portion of the intake valve 2 by its respective tips. The cylinder 20 extends substantially in the radial direction, is pivotally supported by the rocker shaft 10 and is urged by a rocker spring 11, and is driven by a cam of a cam shaft 12 provided on the cylinder head 4 to swing. The heads of the exhaust valves 3 are simultaneously pressed by their respective tips to open and close.

【０００８】さらに、排気弁用ロッカアーム９の主部上
面中央には、図３によく示されているように、シリンダ
２０の略半径方向に沿って延びる１列のリブ２２が形成
されているのに対して、図４によく示されているよう
に、吸気弁用ロッカアーム２１の主部上面には、シリン
ダ２０の略半径方向に沿って延びる２列のリブ２３が設
けられていて、両リブ２３の間に溝２４が形成されてお
り、図示しない燃料ポンプから延びて来た燃料噴射管２
５は、吸気弁用ロッカアーム２１の揺動に対して溝２４
内面に当接することのないように、溝２４内面との間に
十分の間隔が置くようにして溝２４内に収容され、燃料
噴射ノズル１に接続されている。Further, as shown in FIG. 3, a row of ribs 22 extending substantially in the radial direction of the cylinder 20 is formed in the center of the upper surface of the main portion of the rocker arm 9 for the exhaust valve. On the other hand, as well shown in FIG. 4, two rows of ribs 23 extending substantially in the radial direction of the cylinder 20 are provided on the upper surface of the main portion of the intake valve rocker arm 21. A groove 24 is formed between the fuel injection pipe 2 and the fuel injection pipe 2 extending from a fuel pump (not shown).
5 is a groove 24 for rocking of the intake valve rocker arm 21.
It is housed in the groove 24 and is connected to the fuel injection nozzle 1 with a sufficient space between it and the inner surface of the groove 24 so as not to contact the inner surface.

【０００９】上記装置において、燃料噴射管２５は吸気
弁用ロッカアーム２１の主部上面に形成された溝２４内
に収容されていて、吸気弁用ロッカアーム２１の上方に
は配置されていないので、ロッカアーム式ＤＯＨＣエン
ジンであっても、燃料噴射管２５の配設位置を容易に低
く押さえることができ、従って、燃料噴射管２５の配設
構造が比較的簡単化されて、その配管性を向上させるこ
とができると同時に、燃料噴射管２５を比較的短くし
て、高圧燃料噴射エンジンにおける燃料噴射特性を改善
することができ、また、エンジンの全高を容易に低く抑
制することができるため、エンジンの車両搭載時におけ
る利点がとくに大きい。In the above device, the fuel injection pipe 25 is housed in the groove 24 formed in the upper surface of the main portion of the intake valve rocker arm 21, and is not arranged above the intake valve rocker arm 21. Even in the case of the DOHC engine of the type, the disposition position of the fuel injection pipe 25 can be easily kept low, and therefore, the disposition structure of the fuel injection pipe 25 is relatively simplified, and the pipeability thereof is improved. At the same time, the fuel injection pipe 25 can be made relatively short to improve the fuel injection characteristics in the high-pressure fuel injection engine, and the overall height of the engine can be easily suppressed to a low level. The advantage when installed is particularly great.

【００１０】なお、上記実施例では、各吸気弁用ロッカ
アームの先端が２本の吸気弁を同時に開閉するように略
Ｙ字状となっているが、これは略Ｔ字状としても同等の
作用効果を奏することができ、さらには、各吸気弁用ロ
ッカアームが１本の吸気弁を開閉する場合であっても、
周囲の構造等の関係から、その吸気弁用ロッカアームの
上方位置に燃料噴射管を配設するときには、吸気弁用ロ
ッカアームの上面に形成された溝内に燃料噴射管を収容
するように構成すれば、やはり、上記各実施例と同等の
作用効果を奏することができ、また、前記各実施例にお
ける吸気弁用ロッカアーム上面の溝内に、燃料噴射管の
一部を配置するようにしても、それに応じて前記各実施
例と同様な作用効果を奏することができるようになるの
はいうまでもない。In the above embodiment, the tip of each intake valve rocker arm is substantially Y-shaped so that the two intake valves can be opened and closed at the same time. It is possible to achieve the effect, and further, even when each intake valve rocker arm opens and closes one intake valve,
Due to the surrounding structure and the like, when the fuel injection pipe is arranged above the intake valve rocker arm, the fuel injection pipe may be housed in the groove formed on the upper surface of the intake valve rocker arm. Again, it is possible to obtain the same effects as those of the above-mentioned respective embodiments, and even if a part of the fuel injection pipe is arranged in the groove on the upper surface of the intake valve rocker arm in each of the above-mentioned embodiments, It goes without saying that the same operational effects as those of the above-described respective embodiments can be obtained accordingly.

【００１１】[0011]

【発明の効果】本発明にかかるエンジンにおいては、ロ
ッカアームの上面に形成されてシリンダの略半径方向に
沿って延びる溝内に、燃料噴射ノズルに接続された燃料
噴射管の少なくとも一部が配置されて、燃料噴射管を容
易に低い位置に配設することができるので、燃料噴射管
を比較的短く構成して燃料噴射特性を改善することがで
きると共に、エンジンの全高を簡単に低く抑制すること
ができる。In the engine according to the present invention, at least a part of the fuel injection pipe connected to the fuel injection nozzle is arranged in the groove formed on the upper surface of the rocker arm and extending substantially in the radial direction of the cylinder. Since the fuel injection pipe can be easily arranged at a low position, the fuel injection pipe can be made relatively short to improve the fuel injection characteristics, and the overall height of the engine can be easily suppressed to be low. You can

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の実施例における要部縦断面図。FIG. 1 is a longitudinal sectional view of a main part in an embodiment of the present invention.

【図２】上記実施例の要部上面図。FIG. 2 is a top view of a main part of the above embodiment.

【図３】図２の IIIーIII 縦断面拡大図。FIG. 3 is an enlarged vertical sectional view taken along the line III-III in FIG.

【図４】図２のIVーIV縦断面拡大図。FIG. 4 is an enlarged vertical sectional view taken along the line IV-IV in FIG.

【図５】従来装置の要部縦断面図。FIG. 5 is a longitudinal sectional view of a main part of a conventional device.

【符号の説明】[Explanation of symbols]

１ 燃料噴射ノズル ２ 吸気弁 ３ 排気弁 ９ 排気弁用ロッカアーム ２０ シリンダ ２１ 吸気弁用ロッカアーム ２３ リブ ２４ 溝 ２５ 燃料噴射管 1 Fuel Injection Nozzle 2 Intake Valve 3 Exhaust Valve 9 Exhaust Valve Rocker Arm 20 Cylinder 21 Intake Valve Rocker Arm 23 Rib 24 Groove 25 Fuel Injection Pipe

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｍ 55/02 ３３０ Ｂ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display area F02M 55/02 330 B

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 シリンダヘッドに取り付けられた吸気
弁、ロッカシャフトに枢支されてシリンダの略半径方向
に沿って延びカムシャフトにより揺動させられて上記吸
気弁を開閉するロッカアーム、上記吸気弁より上記シリ
ンダの中央寄りに配置され上記シリンダヘッドに固定さ
れた燃料噴射ノズル及び同燃料噴射ノズルに接続された
燃料噴射管を有し、上記ロッカアームの上面には上記略
半径方向に沿って延びる溝が形成され、上記燃料噴射管
の少なくとも一部が上記溝内に配置されたエンジン。1. An intake valve mounted on a cylinder head, a rocker arm pivotally supported by a rocker shaft, extended substantially along a radial direction of a cylinder, and rocked by a cam shaft to open and close the intake valve; A fuel injection nozzle fixed to the cylinder head and located near the center of the cylinder, and a fuel injection pipe connected to the fuel injection nozzle are provided, and a groove extending along the substantially radial direction is formed on the upper surface of the rocker arm. An engine formed and having at least a portion of the fuel injection tube disposed in the groove. 【請求項２】 請求項１において、上記ロッカアームは
その先端が二股に分岐した略Ｙ字状もしくは略Ｔ字状
で、上記各先端により２本の上記吸気弁を開閉するよう
に構成されたエンジン。2. The engine according to claim 1, wherein the rocker arm has a substantially Y-shape or a substantially T-shape with its tip bifurcated, and each of the tips opens and closes the two intake valves. . 【請求項３】 請求項１または請求項２において、上記
燃料噴射管が上記ロッカアームの揺動に対して上記溝の
内面に当接することのないよう上記溝内面との間に間隔
を置いて上記溝内に配置されたエンジン。3. The fuel injection pipe according to claim 1, wherein the fuel injection pipe is spaced from the inner surface of the groove so as not to come into contact with the inner surface of the groove with respect to the rocking of the rocker arm. The engine placed in the groove. 【請求項４】 請求項１〜請求項３のいずれかにおい
て、上記燃料噴射ノズルが２本の上記吸気弁と２本の排
気弁とに囲まれるように上記シリンダヘッドに固定され
たエンジン。4. The engine according to claim 1, wherein the fuel injection nozzle is fixed to the cylinder head so as to be surrounded by the two intake valves and the two exhaust valves. 【請求項５】 請求項１〜請求項４のいずれかにおい
て、上記カムシャフトが上記シリンダヘッド上に設けら
れたエンジン。5. The engine according to claim 1, wherein the camshaft is provided on the cylinder head.
JP6270409A 1994-10-07 1994-10-07 engine Expired - Lifetime JP2939966B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6270409A JP2939966B2 (en) 1994-10-07 1994-10-07 engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6270409A JP2939966B2 (en) 1994-10-07 1994-10-07 engine

Publications (2)

Publication Number Publication Date
JPH08105366A true JPH08105366A (en) 1996-04-23
JP2939966B2 JP2939966B2 (en) 1999-08-25

Family

ID=17485866

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6270409A Expired - Lifetime JP2939966B2 (en) 1994-10-07 1994-10-07 engine

Country Status (1)

Country Link
JP (1) JP2939966B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010111935A (en) * 2008-11-10 2010-05-20 Ntn Corp Rocker arm assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010111935A (en) * 2008-11-10 2010-05-20 Ntn Corp Rocker arm assembly

Also Published As

Publication number Publication date
JP2939966B2 (en) 1999-08-25

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