JPH09195887A - Shield structure of fuel injection pump - Google Patents

Shield structure of fuel injection pump

Info

Publication number
JPH09195887A
JPH09195887A JP490796A JP490796A JPH09195887A JP H09195887 A JPH09195887 A JP H09195887A JP 490796 A JP490796 A JP 490796A JP 490796 A JP490796 A JP 490796A JP H09195887 A JPH09195887 A JP H09195887A
Authority
JP
Japan
Prior art keywords
fuel injection
injection pump
noise
cylinder block
shield member
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
JP490796A
Other languages
Japanese (ja)
Other versions
JP3796789B2 (en
Inventor
Chiharu Togashi
千晴 富樫
Hideaki Shigyo
英明 執行
Teruo Nakada
輝男 中田
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.)
Isuzu Motors Ltd
Original Assignee
Isuzu Motors Ltd
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 Isuzu Motors Ltd filed Critical Isuzu Motors Ltd
Priority to JP00490796A priority Critical patent/JP3796789B2/en
Publication of JPH09195887A publication Critical patent/JPH09195887A/en
Application granted granted Critical
Publication of JP3796789B2 publication Critical patent/JP3796789B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Exhaust Silencers (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

PROBLEM TO BE SOLVED: To reduce a noise radiated from a fuel injection pump itself and a standing wave generated between the fuel injection pump and a cylinder block, by composing a shield member to cover the fuel injection pump by a noise insulating member to cover the noise generating face of the fuel injection pump, and a noise absorption member filled between the fuel injection pump and the cylinder block. SOLUTION: After a fuel injection pump 2A is installed to a cylinder block 1A, a first shield member 11 uses a heat resisting rubber at the lower and the upper sides of the rear surface of the fuel injection pump 2A, and it is formed of the rear side noise insulating members 11a and 11c fixed to the cylinder block 1A, and a rear side noise absorption member 11b formed by filling a foaming material to the part surrounded actually by the cylinder block 1A and the fuel injection pump 2A. And a second shield member 12 is formed of the front side noise insulating member 12a fixing the part not covered by the first shield member 11 by a clip and the like, and the front side noise absorption member 12b made by filling a synthetic resin at the space part surrounded by the first shield member 11, the front side noise insulating member 12a, and the fuel injection pump 2A.

Description

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

【0001】[0001]

【発明の属する技術分野】本発明は、エンジンの騒音に
対して大きな割合を占めている燃料の噴射ポンプ自体か
ら放射される騒音と、この燃料噴射ポンプとエンジンの
シリンダブロックとの間に発生する定在波による騒音
を、低減するためのエンジンの騒音防止装置に関するも
のである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention occurs between noise emitted from the fuel injection pump itself, which accounts for a large proportion of engine noise, and between the fuel injection pump and the cylinder block of the engine. The present invention relates to an engine noise prevention device for reducing noise due to standing waves.

【0002】[0002]

【従来の技術】従来より快適な自動車を製造するために
エンジン騒音が問題となっているが、この騒音にはエン
ジンから発生する騒音と、エンジンのシリンダブロック
と燃料噴射ポンプとの間の音が互いに増幅しあう定在波
による騒音と、燃料噴射ポンプ自体から放射される騒音
とがあり、これらを総合してエンジン騒音としている。
2. Description of the Related Art Engine noise has been a problem in the past for manufacturing comfortable automobiles. The noise generated by the engine and the noise between the engine cylinder block and the fuel injection pump have been known as the noise. There are noise due to standing waves that are mutually amplified and noise emitted from the fuel injection pump itself, and these are collectively referred to as engine noise.

【0003】近時、車内を静粛に保つためにこのエンジ
ン騒音を低減する方法が検討されているが、具体的に
は、図8に示す騒音防止装置が実開平4─95631号
で提案されているように、シリンダブロック1と燃料噴
射ポンプ2との間隙Gを上部と下部でシール材3を介し
てシリンダブロック1の側面と燃料噴射ポンプ2の側面
に取り付けられた金属カバー4a、4bによって閉止
し、この閉止された間隙G部分にグラスウール等の吸音
材5を詰めたものである。しかし、この装置においては
前記定在波を防止できても、この燃料噴射ポンプ2自体
から放射される騒音を防止できない。また、金属カバー
4a、4bの振動による騒音の二次的な発生の問題もあ
る。
Recently, a method of reducing the engine noise in order to keep the inside of the vehicle quiet has been studied. Specifically, a noise prevention device shown in FIG. 8 has been proposed in Japanese Utility Model Publication No. 4-95631. As described above, the gap G between the cylinder block 1 and the fuel injection pump 2 is closed by the metal covers 4a and 4b attached to the side surface of the cylinder block 1 and the side surface of the fuel injection pump 2 via the sealing material 3 at the upper and lower portions. The closed gap G is filled with a sound absorbing material 5 such as glass wool. However, in this device, even if the standing wave can be prevented, the noise radiated from the fuel injection pump 2 itself cannot be prevented. There is also a problem of secondary generation of noise due to vibration of the metal covers 4a and 4b.

【0004】また、図9に示す騒音防止装置が実開平3
─95072号で提案されているが、この装置は、燃料
噴射ポンプ2の前面部に内側にグラスウールなどの吸音
材5を接着した制振鋼板製のケーシング6を設けたもの
である。しかし、この装置においては、シリンダブロッ
ク1と燃料噴射ポンプ2との間隙gが存在するととも
に、前面部のケーシング6に接着された吸音材5と燃料
噴射ポンプ2との間にも空間部分7が残るので、定在波
による騒音を防止できない上にシリンダブロック1から
放射される騒音と燃料噴射ポンプ2自体から放射される
騒音を十分に防止に出来ない。また、ケーシング6に金
属を使用しているので、このケーシング6の振動による
騒音の二次的な発生の問題もある。
Further, the noise prevention device shown in FIG.
As proposed in No. 95072, this device is provided with a casing 6 made of vibration-damping steel plate having a sound absorbing material 5 such as glass wool adhered to the inside of the front surface of the fuel injection pump 2. However, in this device, there is a gap g between the cylinder block 1 and the fuel injection pump 2, and a space portion 7 is also provided between the sound absorbing material 5 bonded to the casing 6 on the front surface and the fuel injection pump 2. Since it remains, noise due to the standing wave cannot be prevented, and noise emitted from the cylinder block 1 and noise emitted from the fuel injection pump 2 itself cannot be sufficiently prevented. Further, since metal is used for the casing 6, there is also a problem of secondary noise generation due to the vibration of the casing 6.

【0005】[0005]

【発明が解決しようとする課題】本発明は燃料噴射ポン
プ自体から放射される騒音と、この燃料噴射ポンプとエ
ンジンのシリンダブロックとの間に発生する定在波によ
る騒音を防止するともに、シリンダブロックから放射さ
れる騒音の一部を低減しようとするものである。
SUMMARY OF THE INVENTION The present invention prevents noise emitted from the fuel injection pump itself and noise due to standing waves generated between the fuel injection pump and the cylinder block of the engine, and also prevents the cylinder block. It is intended to reduce some of the noise emitted from the.

【0006】[0006]

【課題を解決するための手段】前記の問題を解決するた
めに、エンジンのシリンダブロックの側方に間隙を伴っ
て固定された燃料噴射ポンプの表面を遮蔽部材で実質的
に覆っており、前記遮蔽部材は、前記燃料噴射ポンプの
騒音発生面を覆う遮音材と、この燃料噴射ポンプと前記
遮音材との間に充填された吸音材で構成されている燃料
噴射ポンプの遮蔽構造を提供する。
In order to solve the above problems, a surface of a fuel injection pump fixed to a side of a cylinder block of an engine with a gap is substantially covered with a shielding member. The shielding member provides a fuel injection pump shielding structure including a sound insulating material that covers a noise generating surface of the fuel injection pump and a sound absorbing material filled between the fuel injection pump and the sound insulating material.

【0007】遮蔽部材は好ましくは、表面全体を隙間無
く覆い尽くすのがよいが、例えば操作部、配管引出部、
熱放散用の窓などの、騒音防止に関して無視できるよう
な小さな開口や隙間を除いて実質的な意味で燃料噴射ポ
ンプを覆う。この遮蔽構造において、遮蔽部材を構成す
る遮音材はそれ自体から振動音を発生せず音を通過させ
ない性能を持つ材料で、特に耐熱ゴムを使用し、吸音材
は音の発生源からの騒音をその内部において減衰させる
性質を持つ材料で、特に合成樹脂の発泡材を使用するの
がよい。
The shield member preferably covers the entire surface without any gaps. For example, the operating portion, the pipe lead-out portion,
It substantially covers the fuel injection pump except for small openings and gaps such as windows for heat dissipation that are negligible for noise protection. In this shielding structure, the sound insulating material that constitutes the shielding member is a material that does not generate vibration sound from itself and does not allow sound to pass through.In particular, heat-resistant rubber is used, and the sound absorbing material absorbs noise from the sound source. It is preferable to use a foamed material of synthetic resin, which is a material having a property of attenuating inside thereof.

【0008】さらに、前記遮蔽構造において、遮蔽部材
がシリンダブロックと前記燃料噴射ポンプとの間に配置
される第1の遮蔽部材と、この第1の遮蔽部材が配置さ
れない前記燃料噴射ポンプの表面を覆う第2の遮蔽部材
で構成され、これらの第1と第2の遮蔽部材は前記燃料
噴射ポンプの表面で分離可能に形成される燃料噴射ポン
プの遮蔽構造を提供する。
Further, in the above-mentioned shielding structure, a shielding member is disposed between the cylinder block and the fuel injection pump, and a surface of the fuel injection pump where the first shielding member is not disposed. A second shield member for covering is provided, and the first and second shield members provide a shield structure for the fuel injection pump that is separably formed on the surface of the fuel injection pump.

【0009】前記の第1及び第2の遮蔽部材は、遮蔽部
材の分解が容易に行われるような、例えば燃料噴射ポン
プの表面の背面部と前面部をそれぞれ覆うように燃料噴
射ポンプの表面の中央部で、分離可能とする。この場合
に調整・点検・整備に必要な面がまとめて露出し易いよ
うに遮蔽部材を分離可能とすると形成・点検・調整の作
業性がよい。
The first and second shield members are provided on the surface of the fuel injection pump so that the shield member can be easily disassembled, for example, to cover the back surface and the front surface of the fuel injection pump. Separable at the center. In this case, if the shielding members can be separated so that the surfaces required for adjustment, inspection, and maintenance are easily exposed together, the workability of forming, inspection, and adjustment is good.

【0010】また、分離可能な部分の近傍で、遮音材を
燃料噴射ポンプに直接接触させると、吸音材に切れ目を
入れる必要が無く、発泡材の充填時に必要な切れ目部分
を塞ぐための部材と工程を不要にできる。
Further, when the sound insulating material is brought into direct contact with the fuel injection pump in the vicinity of the separable portion, it is not necessary to make a cut in the sound absorbing material, and a member for closing the cut portion required when the foam material is filled. The process can be eliminated.

【0011】[0011]

【発明の実施の形態】以下に図1から図7を参照して、
本発明の第1の実施の形態を説明する。図6に示すよう
に燃料噴射ポンプ2Aは、エンジン10のシリンダブロ
ック1Aの側方に固定され、下部の配管13aから燃料
を吸引し、加圧して上部の配管13bと燃料噴射ノズル
を通じて、シリンダ内に燃料を噴射する。
DETAILED DESCRIPTION OF THE INVENTION Referring to FIGS.
A first embodiment of the present invention will be described. As shown in FIG. 6, the fuel injection pump 2A is fixed to the side of the cylinder block 1A of the engine 10, sucks fuel from the lower pipe 13a, pressurizes it, and passes it through the upper pipe 13b and the fuel injection nozzle, Inject fuel into.

【0012】図7の斜線部分で示すように、本発明の遮
蔽部材11、12は操作用のレバー15や配管13a、
13bなどの配置部分を除いて、燃料噴射ポンプ2Aを
実質的に覆っている。図1および図2を参照して、遮音
材11a、11c、12aと吸音材11b、12bとで
構成される本発明の遮蔽部材11、12の形成方法を以
下に説明する。
As shown by the hatched portion in FIG. 7, the shielding members 11 and 12 of the present invention are the operating lever 15 and the pipe 13a.
The fuel injection pump 2A is substantially covered except for the arrangement portion such as 13b. With reference to FIG. 1 and FIG. 2, a method for forming the shielding members 11 and 12 of the present invention composed of the sound insulating materials 11a, 11c and 12a and the sound absorbing materials 11b and 12b will be described below.

【0013】まず第1の工程では、シリンダブロック1
Aに燃料噴射ポンプ2Aを取り付けた後に、燃料噴射ポ
ンプ2Aの背面部の下面側に耐熱ゴムを使用した背面部
遮音材11aをボルト16などでシリンダブロック1A
に固定して、シリンダブロック1Aと燃料噴射ポンプ2
Aとの間隙の下面側を実質的に覆う背面部遮音材11a
を取り付ける。次に、この背面部遮音材11aとシリン
ダブロック1Aと燃料噴射ポンプ2Aとで実質的に囲わ
れた部分に合成樹脂の発泡材を充填して背面部吸音材1
1bを形成する。この背面部吸音材11bは、充填して
形成されるので、小さな隙間も空けることなく形成でき
る。
First, in the first step, the cylinder block 1
After the fuel injection pump 2A is attached to A, the rear surface sound insulating material 11a made of heat resistant rubber is attached to the lower surface side of the rear surface of the fuel injection pump 2A by the bolts 16 or the like in the cylinder block 1A.
Fixed to the cylinder block 1A and the fuel injection pump 2
Back surface sound insulation material 11a that substantially covers the lower surface side of the gap with A
Attach. Then, a synthetic resin foam material is filled in a portion substantially surrounded by the back surface sound insulation material 11a, the cylinder block 1A, and the fuel injection pump 2A, and the back surface sound absorption material 1 is formed.
1b is formed. Since the back surface sound absorbing material 11b is formed by being filled, it can be formed without forming a small gap.

【0014】さらに、燃料噴射ポンプ2Aの背面部の上
面側に耐熱ゴムを使用した背面部遮音材11aをボルト
16などでシリンダブロック1Aに固定して、シリンダ
ブロック1Aと燃料噴射ポンプ2Aとの間隙の上面側を
実質的に覆う背面部遮音材11cを取り付ける。この第
1の工程により背面部遮音材11a、11cと背面部吸
音材11bとで構成される第1の遮蔽部材11を形成す
ることができる。
Further, a back surface sound insulation member 11a made of heat-resistant rubber is fixed to the cylinder block 1A with bolts 16 or the like on the upper surface side of the back surface of the fuel injection pump 2A, and a gap between the cylinder block 1A and the fuel injection pump 2A. The rear surface sound insulating material 11c that substantially covers the upper surface side of is attached. By this first step, it is possible to form the first shielding member 11 including the back surface sound insulating materials 11a and 11c and the back surface sound absorbing material 11b.

【0015】この発泡材の充填は、遮音材11a、11
cの一部分を燃料噴射ポンプ2Aの表面に直接接触させ
た構造にすると、間隙を塞ぐための部材と工程が不要に
なり、発泡材の充填作業を簡便化できる。第2の工程と
して、第1の遮蔽部材11を作成した後に、前面部遮音
材12aを、燃料噴射ポンプ2Aの第1の遮蔽部材11
で覆われていない表面を実質的に覆うようにクリップ1
7や面状ファスナーなどを用いた方法で固定する。次に
第1の遮蔽部材11と前面部遮音材12aと燃料噴射ポ
ンプ2Aとで実質的に囲われた空間部分に合成樹脂の発
泡材を充填して背面部吸音材12bを形成する。この第
2の工程により、背面部吸音材12bと前面部遮音材1
2aとで構成される、第2の遮蔽部材12を形成するこ
とができる。
This foam material is filled with the sound insulating materials 11a, 11a.
With a structure in which a part of c is brought into direct contact with the surface of the fuel injection pump 2A, a member and a process for closing the gap are unnecessary, and the work of filling the foam material can be simplified. As a second step, after the first shielding member 11 is created, the front surface sound insulating material 12a is attached to the first shielding member 11 of the fuel injection pump 2A.
Clip 1 to substantially cover the surface not covered with
It is fixed by a method using 7 or a sheet fastener. Next, the space portion substantially surrounded by the first shielding member 11, the front surface sound insulating material 12a and the fuel injection pump 2A is filled with a synthetic resin foam material to form the rear surface sound absorbing material 12b. By this second step, the back surface sound absorbing material 12b and the front surface sound insulating material 1
It is possible to form the second shielding member 12 composed of 2a.

【0016】この第2の遮蔽部材12は、燃料噴射ポン
プ2Aのレバー15などの作動部分及び配管13a、1
3b部分や熱放散や発泡材の充填用注入のために必要に
応じて開けたの除外部分18を除いて、噴射ポンプ1A
の表面を実質的に覆う構造にしてある。この除外部分1
8は必要に応じて第1の遮蔽部材11側にも設けること
ができる。
The second shield member 12 is an operating portion such as the lever 15 of the fuel injection pump 2A and the pipes 13a and 1a.
The injection pump 1A except for the portion 3b and the exclusion portion 18 which is opened as needed for heat dissipation and filling for filling the foam material.
Has a structure that substantially covers the surface of the. This excluded part 1
8 can also be provided on the first shielding member 11 side as required.

【0017】これらの工程により、吸音材11b、12
bと遮音材11a、11c、12aとで構成される遮蔽
部材11、12で燃料噴射ポンプ2Aの表面を実質的に
覆う遮蔽構造を形成できる。なお、この吸音材11b、
12bの充填工程は、必ずしもエンジンのシリンダブロ
ック1Aへ燃料噴射ポンプ2Aを取り付ける作業時のみ
に行う必要はなく、同じ形状の型が有る場合には、作業
工程の都合に応じてあらかじめ前記の型と遮音材11
a、11c、12aを用いて成形しておくこともでき
る。
By these steps, the sound absorbing materials 11b, 12
A shielding structure that substantially covers the surface of the fuel injection pump 2A can be formed by the shielding members 11 and 12 configured by b and the sound insulating materials 11a, 11c, and 12a. The sound absorbing material 11b,
The filling step of 12b does not necessarily have to be performed only when the fuel injection pump 2A is attached to the cylinder block 1A of the engine. Sound insulation material 11
It is also possible to use a, 11c and 12a for molding.

【0018】これらの第1と第2の遮蔽部材11、12
は燃料噴射ポンプ2Aの表面で、クリップ17や図示し
ていない面状ファスナーなどで第1の遮蔽部材11と第
2の遮蔽部材12とが分離及び接続可能に構成する。こ
の分離可能な部分を、遮音材12aの一部分を燃料噴射
ポンプ2Aの表面に直接接触させた構造にすれば、燃料
噴射ポンプ2Aと遮音材11a、11cとの間に間隙を
開けて、吸音材を配置した場合に比べて、発泡材の充填
時に必要となる前記間隙を塞ぐための部材と工程が不要
になり、発泡材の充填作業を簡便化できる。この分離可
能な構成に関しては、例えば、遮蔽部材11、12を燃
料噴射ポンプ2の背面部と前面部とに分割し、形成・分
解・組立を容易に行う事ができるように、燃料噴射ポン
プ2Aの前後方向の中央部付近の表面部分で、分離可能
に作成する。
These first and second shielding members 11 and 12
Is a surface of the fuel injection pump 2A, and the first shield member 11 and the second shield member 12 are configured to be separable and connectable by a clip 17 or a planar fastener (not shown). If this separable part is structured such that a part of the sound insulating material 12a is brought into direct contact with the surface of the fuel injection pump 2A, a gap is opened between the fuel injection pump 2A and the sound insulating materials 11a and 11c, and the sound absorbing material is formed. As compared with the case of disposing, the member and the process for closing the gap, which are required at the time of filling the foam material, are unnecessary, and the work of filling the foam material can be simplified. With regard to this separable structure, for example, the shielding members 11 and 12 are divided into a back surface portion and a front surface portion of the fuel injection pump 2 so that the fuel injection pump 2A can be easily formed, disassembled, and assembled. The surface part near the central part in the front-back direction is made separable.

【0019】この分割に際して、特に調整・点検・整備
に必要な部分の燃料噴射ポンプ2の表面をまとめて露出
し易くした形状で遮蔽部材12を形成すると、調整・点
検・整備などの際の作業を簡便化する事ができる。これ
らの第1の遮蔽部材11や第2の遮蔽部材12は、必ず
しも単一である必要はなく、形成・分解・組立が容易で
あるように、必要に応じて複数個に分離可能な構成にす
る。
At the time of this division, if the shielding member 12 is formed in such a shape that the surfaces of the fuel injection pump 2 that are particularly necessary for adjustment, inspection, and maintenance are collectively exposed, it will be necessary to perform adjustment, inspection, and maintenance work. Can be simplified. The first shielding member 11 and the second shielding member 12 do not necessarily have to be single, and have a structure that can be separated into a plurality of pieces as needed so that they can be easily formed, disassembled, and assembled. To do.

【0020】図3と図4は第2の実施の形態を示したも
ので、シリンダブロック1Aと燃料噴射ポンプ2Aとの
間の第1の遮蔽部材11を吸音材11b、遮音材11
a、11c、吸音材11bというようにサンドイッチ構
造で構成したものである。このようなサンドイッチ構造
とすることで、剛性の大きな遮音材11a、11cによ
って、吸音材11bを保持する効果が高まるとともに、
遮音材11a、11cを燃料噴射ポンプ2の背面部にも
配置できるので騒音防止効果も高めることができる。こ
のサンドイッチ構造は、第2の遮蔽部材12にも用いて
もよい。
FIG. 3 and FIG. 4 show the second embodiment, in which the first shielding member 11 between the cylinder block 1A and the fuel injection pump 2A is the sound absorbing material 11b and the sound insulating material 11.
It has a sandwich structure such as a, 11c, and sound absorbing material 11b. With such a sandwich structure, the effect of holding the sound absorbing material 11b is enhanced by the sound insulating materials 11a and 11c having high rigidity, and
Since the sound insulation members 11a and 11c can also be arranged on the back surface of the fuel injection pump 2, the noise prevention effect can be enhanced. This sandwich structure may also be used for the second shield member 12.

【0021】図5は、この騒音防止の効果を示したグラ
フで、グラフの横軸はエンジンの回転数を示し、縦軸は
エンジンに近接して測定した騒音レベルを1目盛り2d
Bという相対的な差で示す。線Aは、エンジンに近接し
た場所の、遮蔽構造を設けない場合の騒音レベルを示
し、線Bは、本発明の遮蔽構造を設けた場合の騒音レベ
ルを示す。そして両線A、Bの間の斜線部の領域Cは、
騒音レベルの前記両者の差であり、本発明による騒音防
止効果を表している。このグラフの領域Cが示すよう
に、本発明はエンジン回転数によって騒音レベルの低減
量に差はあるもの、大きな騒音防止の効果をあげてい
る。
FIG. 5 is a graph showing the effect of preventing noise. The horizontal axis of the graph represents the engine speed, and the vertical axis represents the noise level measured in the vicinity of the engine on a scale of 2d.
The relative difference of B is shown. Line A shows the noise level near the engine without the shield structure, and line B shows the noise level with the shield structure of the present invention. Then, the shaded area C between the lines A and B is
It is the difference between the above two noise levels, and represents the noise prevention effect according to the present invention. As indicated by the area C in this graph, the present invention exerts a great effect of preventing noise, although there is a difference in the noise level reduction amount depending on the engine speed.

【0022】従って、上記に示した本発明の実施の形態
により、エンジン騒音の防止に高い効果を発揮でき、し
かも吸音材の形成は充填によって行うので容易であり、
さらに、遮蔽部材を前面部と背面部に複数個に分離可能
して分解が容易としているので燃料噴射ポンプの調整・
点検・整備の作業が行い易い、エンジンの騒音防止のた
めの、燃料噴射ポンプの遮蔽構造を提供できる。
Therefore, according to the embodiment of the present invention described above, a high effect can be exhibited in preventing engine noise, and the sound absorbing material is easily formed by filling.
Furthermore, the front and rear shields can be separated into multiple parts for easy disassembly, so adjustment of the fuel injection pump
It is possible to provide a fuel injection pump shielding structure for preventing engine noise that facilitates inspection and maintenance work.

【0023】[0023]

【発明の効果】請求項1の発明により、燃料噴射ポンプ
の表面を吸音材と遮音材で構成される遮蔽部材で実質的
に覆っているので、燃料噴射ポンプ自体から放射される
騒音や、シリンダブロックと燃料噴射ポンプの間の定在
波による騒音を防止できる。さらにはシリンダブロック
の表面の一部分も遮蔽部材で覆うことができるので、シ
リンダブロックから放射される騒音の一部を防止でき
る。
According to the first aspect of the present invention, since the surface of the fuel injection pump is substantially covered with the shielding member composed of the sound absorbing material and the sound insulating material, the noise emitted from the fuel injection pump itself and the cylinder. Noise due to standing waves between the block and the fuel injection pump can be prevented. Further, since a part of the surface of the cylinder block can be covered with the shielding member, a part of noise emitted from the cylinder block can be prevented.

【0024】請求項2の発明により、遮音材として耐熱
ゴムを使用しているので、これの振動に対する減衰特性
により、エンジンシリンダブロックと燃料噴射ポンプか
ら伝搬してくる振動を減衰でき、騒音の二次発生を防止
できる。また、吸音材を合成樹脂の発泡材を充填して形
成することにより、発泡材の吸音特性によって騒音を防
止できるとともに、シリンダブロックと燃料噴射ポンプ
と遮音材との間の定在波が発生しそうな空間を隙間なく
埋めることができるので、定在波による騒音の発生も防
止できる。さらに、吸音材の成形作業が容易になるの
で、遮蔽部材形成の際の作業効率が向上する。
According to the second aspect of the present invention, since the heat-resistant rubber is used as the sound insulating material, the vibration propagating property thereof can damp the vibration propagating from the engine cylinder block and the fuel injection pump, thereby reducing noise. The next occurrence can be prevented. Also, by forming the sound absorbing material by filling it with a synthetic resin foam material, it is possible to prevent noise due to the sound absorbing characteristics of the foam material, and a standing wave is likely to occur between the cylinder block, the fuel injection pump, and the sound insulation material. Since it is possible to fill a large space without any gaps, it is possible to prevent the generation of noise due to standing waves. Further, since the work of molding the sound absorbing material is facilitated, the work efficiency in forming the shielding member is improved.

【0025】請求項3の発明では遮蔽材が複数個に分離
可能なので、形成作業が容易になるとともに、調整・点
検・整備のための分解・組立が容易となる。特に遮蔽部
材の分割形状を調整・点検・整備に必要な部分をまとめ
て露出しやすい形状にした場合には、分解に必要な遮蔽
部材の個数が少なくて済み、さらに分解・組立の作業性
を向上できる。
According to the third aspect of the present invention, since the shielding material can be separated into a plurality of pieces, the forming work is facilitated and the disassembling / assembling for adjustment / inspection / maintenance is facilitated. Especially when the divided shape of the shielding member is made into a shape that makes it easy to expose the parts required for adjustment, inspection, and maintenance, the number of shielding members required for disassembly is small, and workability of disassembly and assembly is further improved. Can be improved.

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

【図1】第1の実施の形態の構造を示す平面断面図であ
る。
FIG. 1 is a plan sectional view showing a structure of a first embodiment.

【図2】第1の実施の形態の構造を示す側面断面図であ
る。
FIG. 2 is a side cross-sectional view showing the structure of the first embodiment.

【図3】第2の実施の形態の構造を示す平面断面図であ
る。
FIG. 3 is a plan sectional view showing a structure of a second embodiment.

【図4】第2の実施の形態の構造を示す側面断面図であ
る。
FIG. 4 is a side sectional view showing the structure of the second embodiment.

【図5】騒音の低減効果を示すグラフである。FIG. 5 is a graph showing a noise reduction effect.

【図6】噴射ポンプ取り付け位置を示す斜視図である。FIG. 6 is a perspective view showing an injection pump mounting position.

【図7】噴射ポンプの遮蔽部分を示す斜視図である。FIG. 7 is a perspective view showing a shielding portion of the injection pump.

【図8】従来の実施の形態の構造を示す側面断面図であ
る。
FIG. 8 is a side sectional view showing a structure of a conventional embodiment.

【図9】従来の実施の形態の構造を示す側面断面図であ
る。
FIG. 9 is a side sectional view showing a structure of a conventional embodiment.

【符号の説明】[Explanation of symbols]

1、1A シリンダブロック 2、2A 燃料噴射ポンプ 3 シール材 4a、4b 金属カバー 5 吸音材 6 ケーシング 7 空間部分 8 ラバー 9a 上側ステー 9b 下側ステー 10 エンジン 11 第1の遮蔽部材 11a、11c 背面部遮音材 11b 背面部吸音材 12 第2の遮蔽部材 12a 前面部遮音材 12b 前面部吸音材 13a、13b 配管 15 レバー 16 ボルト 17 クリップ 18 除外部分 1, 1A Cylinder Block 2, 2A Fuel Injection Pump 3 Sealing Material 4a, 4b Metal Cover 5 Sound Absorbing Material 6 Casing 7 Space Part 8 Rubber 9a Upper Stay 9b Lower Stay 10 Engine 11 First Shielding Member 11a, 11c Backside Sound Insulation Material 11b Rear surface sound absorbing material 12 Second shielding member 12a Front surface sound insulating material 12b Front surface sound absorbing material 13a, 13b Piping 15 Lever 16 Bolt 17 Clip 18 Excluded part

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 エンジンのシリンダブロックの側方に間
隙を伴って固定された燃料噴射ポンプの表面を遮蔽部材
で実質的に覆っており、前記遮蔽部材は、前記燃料噴射
ポンプの騒音発生面を覆う遮音材と、この燃料噴射ポン
プと前記遮音材との間に充填された吸音材で構成されて
いる燃料噴射ポンプの遮蔽構造。
1. A surface of a fuel injection pump fixed laterally of a cylinder block of an engine with a gap is substantially covered with a shielding member, and the shielding member covers a noise generating surface of the fuel injection pump. A shielding structure for a fuel injection pump, comprising a sound insulating material for covering and a sound absorbing material filled between the fuel injection pump and the sound insulating material.
【請求項2】 前記遮蔽部材を構成する遮音材が耐熱ゴ
ムで、吸音材が合成樹脂の発泡材で構成されている請求
項1記載の燃料噴射ポンプの遮蔽構造。
2. The shielding structure for a fuel injection pump according to claim 1, wherein the sound insulating material forming the shielding member is a heat-resistant rubber, and the sound absorbing material is a foamed material of synthetic resin.
【請求項3】 前記遮蔽部材がシリンダブロックと前記
燃料噴射ポンプとの間に配置される第1の遮蔽部材と、
この第1の遮蔽部材が配置されない前記燃料噴射ポンプ
の表面を覆う第2の遮蔽部材で構成され、これらの第1
と第2の遮蔽部材は前記燃料噴射ポンプの表面で分離可
能に形成されている請求項1あるいは2記載の燃料噴射
ポンプの遮蔽構造。
3. A first shielding member, wherein the shielding member is arranged between a cylinder block and the fuel injection pump,
The second shield member covers the surface of the fuel injection pump in which the first shield member is not arranged.
The shield structure for a fuel injection pump according to claim 1 or 2, wherein the second shield member and the second shield member are formed so as to be separable from each other on the surface of the fuel injection pump.
JP00490796A 1996-01-16 1996-01-16 Shielding structure of fuel injection pump Expired - Fee Related JP3796789B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP00490796A JP3796789B2 (en) 1996-01-16 1996-01-16 Shielding structure of fuel injection pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP00490796A JP3796789B2 (en) 1996-01-16 1996-01-16 Shielding structure of fuel injection pump

Publications (2)

Publication Number Publication Date
JPH09195887A true JPH09195887A (en) 1997-07-29
JP3796789B2 JP3796789B2 (en) 2006-07-12

Family

ID=11596724

Family Applications (1)

Application Number Title Priority Date Filing Date
JP00490796A Expired - Fee Related JP3796789B2 (en) 1996-01-16 1996-01-16 Shielding structure of fuel injection pump

Country Status (1)

Country Link
JP (1) JP3796789B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190211781A1 (en) * 2016-03-01 2019-07-11 CT Energy Holdings, LLC Fuel heating apparatus and methods
CN113982795A (en) * 2021-10-19 2022-01-28 建新赵氏科技有限公司 Engine fuel pump guard plate assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190211781A1 (en) * 2016-03-01 2019-07-11 CT Energy Holdings, LLC Fuel heating apparatus and methods
US11725613B2 (en) * 2016-03-01 2023-08-15 CT Energy Holdings, LLC Fuel heating apparatus and methods
CN113982795A (en) * 2021-10-19 2022-01-28 建新赵氏科技有限公司 Engine fuel pump guard plate assembly

Also Published As

Publication number Publication date
JP3796789B2 (en) 2006-07-12

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