JP2005172197A - Vibration restricting fastening structure - Google Patents

Vibration restricting fastening structure Download PDF

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Publication number
JP2005172197A
JP2005172197A JP2003416691A JP2003416691A JP2005172197A JP 2005172197 A JP2005172197 A JP 2005172197A JP 2003416691 A JP2003416691 A JP 2003416691A JP 2003416691 A JP2003416691 A JP 2003416691A JP 2005172197 A JP2005172197 A JP 2005172197A
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fastening
vibration
bolt
lower case
stepped
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JP4281540B2 (en
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Michie Sasaki
理江 佐々木
Noritaka Suzuki
徳貴 鈴木
Takumi Takahashi
拓巳 高橋
Takeshi Abe
健 阿部
Michinari Ozawa
通成 小澤
Jiyunji Yamamoto
淳氏 山本
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure to fasten two fastening members to a counter member in such a way that vibration is restricted. <P>SOLUTION: In this fastening structure, a first fastening member 18 and a second fastening member 22 are placed on a base body as the counter member 14, and the fastening members 18 and 22 are fastened/fixed to the base body 14. To the base body 14, the first fastening member 18 is fastened/fixed by a stepped bolt 6 having a step 5 at a center. The second fastening member 22 is placed on the step 5 to insert a bolt shaft 10. A nut 12 is engaged with the bolt shaft 10 through a rubber member 30. The second fastening member 22 is thus fastened/fixed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、上下に分割されたシリンダヘッドカバーのような二つの物体を被締結部材に固定する締結構造に係り、特に振動・騒音対策として有効な浮かし構造で固定する振動抑制締結構造に関するものである。   The present invention relates to a fastening structure for fixing two objects such as a cylinder head cover divided into upper and lower parts to a fastened member, and particularly to a vibration suppressing fastening structure for fixing with a floating structure effective as a countermeasure against vibration and noise. .

従来、図２に示すように、エンジンのシリンダヘッド１４に取り付けられるヘッドカバー１７は、ロアーケース１８とアッパーケース２２とからなり、各々に設けられるボス部１６、２０、２５にボルトが挿入され、締付・固定される。エンジンの燃焼に伴いシリンダヘッド１４が振動し、この振動がロアーケース１８とアッパーケース２２に伝達することで、騒音が発生する。   Conventionally, as shown in FIG. 2, the head cover 17 attached to the cylinder head 14 of the engine is composed of a lower case 18 and an upper case 22, and bolts are inserted into boss portions 16, 20, and 25 provided in the respective cases, and tightened. Attached / fixed. As the engine burns, the cylinder head 14 vibrates and this vibration is transmitted to the lower case 18 and the upper case 22 to generate noise.

この騒音の原因となる振動を抑制するために用いられる従来の振動抑制締結構造を図５により説明する。   A conventional vibration suppression fastening structure used to suppress the vibration that causes this noise will be described with reference to FIG.

図５に示すように、ロアーケース１８は、ガスケット３６を介しシリンダヘッド１４に載置され、通しボルト３８とこの通しボルト３８に嵌合されるラバー焼付カラー３０により締付・固定される。アッパーケース２２は、ロアーケース１８との間にゴムパッキン４０を介し載置され、ロアーケース１８と同じく通しボルト３８とラバー焼付カラー３０により締付・固定される。さらに、アッパーケース２２と通しボルト３８との間にラバー焼付カラー３０のラバー部４１を介すことで、アッパーケース２２が、振動を遮断するための浮かし構造で固定されるようにしている（特許文献１参照）。   As shown in FIG. 5, the lower case 18 is placed on the cylinder head 14 via a gasket 36, and is fastened and fixed by a through bolt 38 and a rubber printing collar 30 fitted to the through bolt 38. The upper case 22 is placed between the lower case 18 via a rubber packing 40, and is fastened and fixed by a through bolt 38 and a rubber baking collar 30 as in the lower case 18. Further, the rubber case 41 of the rubber baking collar 30 is interposed between the upper case 22 and the through-bolt 38 so that the upper case 22 is fixed with a floating structure for blocking vibration (patent). Reference 1).

特開平１０−１１０６２７号公報JP-A-10-110627

しかしながら、ラバー焼付カラー３０のラバー部４１を締め切らないように通しボルト３８で締付けられるため、後述するようにロアーケース１８の締付力が弱く支持剛性が不足し、シリンダヘッド１４から伝わる振動によりロアーケース１８が、大きく振動し、騒音を発生させる。例えば、この際のロアーケース１８の横曲げ振動モードを例にとると、共振点より低い周波数では弓状に反り曲がるように変形し、共振点付近では太鼓状に拡がるように変形するような振動モードとなる。また、共振点に関係なくピーク付近の振動モードも大きく影響する。   However, since the rubber portion 41 of the rubber printing collar 30 is tightened with the through bolts 38 so as not to be fully tightened, the lower case 18 has a weak tightening force and insufficient support rigidity, as will be described later, and vibrations transmitted from the cylinder head 14 cause the lower The case 18 vibrates greatly and generates noise. For example, taking the transverse bending vibration mode of the lower case 18 at this time as an example, vibration that deforms so as to bend in a bow shape at a frequency lower than the resonance point, and deforms so as to expand in a drum shape near the resonance point. It becomes a mode. In addition, the vibration mode near the peak is greatly influenced regardless of the resonance point.

このため、ロアーケース１８はラバー焼付カラー３０の最下端部のみが当接するだけで締付けられるため、ロアーケース１８の締結断面積が小さく支持剛性が不足し、ロアーケース１８が、大きく振動し、騒音を発生させる。   For this reason, since the lower case 18 is fastened only by contacting only the lowermost end portion of the rubber printing collar 30, the fastening cross-sectional area of the lower case 18 is small and the supporting rigidity is insufficient, and the lower case 18 vibrates greatly, resulting in noise. Is generated.

一方、ロアーケース１８の支持剛性をできるだけ高めるようにラバー焼付カラー３０のラバー部４１を押しつぶす構成として通しボルト３８を強く締め付けると、アッパーケース２２を支持している浮かし構造の本来の効果が得られず、アッパーケース２２は大きく振動し、騒音を発生させる。   On the other hand, if the through bolts 38 are tightened so that the rubber portion 41 of the rubber baking collar 30 is crushed so as to increase the support rigidity of the lower case 18 as much as possible, the original effect of the floating structure supporting the upper case 22 can be obtained. The upper case 22 vibrates greatly and generates noise.

要するに、ロアーケース１８の支持剛性を高め得る通しボルト３８の締付力と、アッパーケース２２を支持する浮かし構造の効果を発揮し得る通しボルト３８の締付力とが異なるため、通しボルト３８の一つの締付力では振動を効果的に抑制し締結することが困難である。   In short, the tightening force of the through bolt 38 that can increase the support rigidity of the lower case 18 and the tightening force of the through bolt 38 that can exhibit the effect of the floating structure that supports the upper case 22 are different. It is difficult to tighten and suppress vibrations effectively with a single tightening force.

そこで、本発明の目的は、上記課題を解決し、シリンダヘッドなどの被締結部材に、ロアーケースとアッパーケースなどの二つの締結部材を振動を抑制するように締結する構造を提供することにある。   Accordingly, an object of the present invention is to solve the above-described problems and provide a structure for fastening two fastening members such as a lower case and an upper case to a member to be fastened such as a cylinder head so as to suppress vibration. .

上記目的を達成するための請求項１に係る発明は、被締結部材である基体上に第１締結部材と第２締結部材を載置し、これら締結部材を上記基体に締付・固定する締結構造において、上記基体に上記第１締結部材を、長手方向の中間部に段部を有する段付きボルトで締結・固定し、その段部上に、ボルト軸を挿通するように上記第２締結部材を載置し、上記ボルト軸にラバー部材を介してナットを螺合して上記第２締結部材を締付・固定するものである。   In order to achieve the above object, the invention according to claim 1 is the fastening in which the first fastening member and the second fastening member are placed on the base body to be fastened, and the fastening members are fastened and fixed to the base body. In the structure, the first fastening member is fastened and fixed to the base by a stepped bolt having a stepped portion in the longitudinal intermediate portion, and the bolt shaft is inserted over the stepped portion. And a nut is screwed onto the bolt shaft via a rubber member to fasten and fix the second fastening member.

上記目的を達成するための請求項２に係る発明は、上記基体は、シリンダヘッドであり、上記締結部材は、上記第１締結部材としてのロアーケースと、上記第２締結部材としてのアッパーケースからなるヘッドカバーであり、かつ上記ラバー部材がラバー焼付カラーであるものである。   According to a second aspect of the invention for achieving the above object, the base is a cylinder head, and the fastening member includes a lower case as the first fastening member and an upper case as the second fastening member. And the rubber member is a rubber baking collar.

上記目的を達成するための請求項３に係る発明は、上記ロアーケースには、上記段付きボルトの段部を回転可能かつ密に収容する凹部が形成されるものである。   According to a third aspect of the present invention for achieving the above object, the lower case is formed with a recess for rotatably and densely accommodating the stepped portion of the stepped bolt.

上記目的を達成するための請求項４に係る発明は、上記アッパーケースには、上記段付きボルトの段部を回転可能に収容する凹部が形成されるものである。   According to a fourth aspect of the invention for achieving the above object, the upper case is formed with a recess for rotatably accommodating the stepped portion of the stepped bolt.

本発明によれば、以下のような優れた効果を発揮するものである。   According to the present invention, the following excellent effects are exhibited.

（１）段付きボルトにより第１締結部材を最適な締付力で固定し、段付きボルトに螺合されるナットにより第２締結部材を最適な締付力で固定することで、第１締結部材と第２締結部材とに発生する振動を各々効果的に抑制することができる。   (1) The first fastening member is fixed with the optimal tightening force by the stepped bolt, and the second fastening member is fixed with the optimal tightening force by the nut that is screwed to the stepped bolt. Vibrations generated in the member and the second fastening member can be effectively suppressed.

（２）段付きボルトの段部により第１締結部材を締付けることで、第１締結部材の締結断面積が広くなり、これにより第１締結部材の支持剛性が高くなり振動拡大を抑制することができる。   (2) By fastening the first fastening member with the stepped portion of the stepped bolt, the fastening cross-sectional area of the first fastening member is widened, which increases the support rigidity of the first fastening member and suppresses vibration expansion. it can.

以下、本発明の好適な一実施形態を添付図面に基づいて詳述する。   Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

本実施の形態は、本発明の振動抑制締結構造をシリンダヘッド１４とこれに取り付けられるヘッドカバー１７とを締結する構造に適用するもので、先ず、図１、２に基づき本実施の形態の構成を説明する。   In the present embodiment, the vibration suppression fastening structure of the present invention is applied to a structure for fastening a cylinder head 14 and a head cover 17 attached thereto. First, the configuration of the present embodiment is based on FIGS. explain.

図２はシリンダヘッド１４とヘッドカバー１７の構成図を示す。   FIG. 2 shows a configuration diagram of the cylinder head 14 and the head cover 17.

図２に示すように、被締結部材であるシリンダヘッド１４（基体）に取り付けられるヘッドカバー１７は、第２締結部材であるアッパーケース２２と、インジェクター（図示しない）を配置するスペースを確保するための底上げ部材としての第１締結部材であるロアーケース１８とからなる。これらロアーケース１８とアッパーケース２２は、締結点を少なくするために、ロアーケース１８をアッパーケース２２とシリンダヘッド１４の間に挟み、後述する段付きボルト６により共に締付・固定される。   As shown in FIG. 2, the head cover 17 attached to the cylinder head 14 (base body) that is a member to be fastened is for securing a space for arranging an upper case 22 that is a second fastening member and an injector (not shown). The lower case 18 is a first fastening member as a bottom raising member. The lower case 18 and the upper case 22 are clamped and fixed together by a stepped bolt 6 described later, with the lower case 18 sandwiched between the upper case 22 and the cylinder head 14 in order to reduce fastening points.

シリンダヘッド１４がエンジンの燃焼に伴い加振力を受け振動すると、この振動がロアーケース１８とアッパーケース２２に伝わり、さらにロアーケース１８とアッパーケース２２が振動することで、騒音が発生する。このような騒音の原因となる振動を低減するための締結構造として、本実施の形態の振動抑制締結構造が用いられる。   When the cylinder head 14 vibrates due to the excitation force accompanying the combustion of the engine, this vibration is transmitted to the lower case 18 and the upper case 22, and further, the lower case 18 and the upper case 22 vibrate to generate noise. As a fastening structure for reducing such vibration that causes noise, the vibration suppressing fastening structure of the present embodiment is used.

図１は、本実施の形態の振動抑制締結構造の構成図を示す。   FIG. 1 shows a configuration diagram of a vibration suppression fastening structure of the present embodiment.

図１に示すように、シリンダヘッド１４上にガスケット２を介しロアーケース１８が載置され、このロアーケース１８は長手方向の中央部に段部５を有する段付きボルト６により締結・固定される。ロアーケース１８上には、段付きボルト６のボルト軸１０が挿通するようにアッパーケース２２がゴムパッキン８を介し載置され、そして、突出したボルト軸１０にラバー部材であるラバー焼付カラー３０を挿入しナット１２を螺合することで、アッパーケース２２が締付・固定される。   As shown in FIG. 1, a lower case 18 is placed on a cylinder head 14 via a gasket 2, and the lower case 18 is fastened and fixed by a stepped bolt 6 having a step portion 5 at the center in the longitudinal direction. . An upper case 22 is placed on the lower case 18 through the rubber packing 8 so that the bolt shaft 10 of the stepped bolt 6 is inserted, and a rubber baking collar 30 as a rubber member is placed on the protruding bolt shaft 10. The upper case 22 is fastened and fixed by inserting and screwing the nut 12.

シリンダヘッド１４はその外周に沿いボス部１６が設けられ、このボス部１６の中心部には段付きボルト６を螺合するためのねじ穴１５が形成される（図２参照）。   A boss portion 16 is provided along the outer periphery of the cylinder head 14, and a screw hole 15 for screwing the stepped bolt 6 is formed at the center of the boss portion 16 (see FIG. 2).

ロアーケース１８は、その外周に沿いボス部２０が設けられる。このボス部２０の中心部には、段付きボルト６を挿入するための貫通孔１９が上下方向に延出するように形成され、また、ボス部２０の上面部には段付きボルト６の段部５が回転可能かつ密に収容される凹部２１が形成される（図１、２参照）。   The lower case 18 is provided with a boss portion 20 along the outer periphery thereof. A through hole 19 for inserting the stepped bolt 6 is formed in the central portion of the boss portion 20 so as to extend in the vertical direction, and the step of the stepped bolt 6 is formed on the upper surface portion of the boss portion 20. A recess 21 is formed in which the portion 5 is rotatably and closely accommodated (see FIGS. 1 and 2).

アッパーケース２２は、材質がアルミニウムからなり、その外周に沿いボス部２５が設けられる。このボス部２５の中心部には、ラバー焼付カラー３０が挿入される貫通孔２４が上下方向に延出するように形成される（図２参照）。なお、アッパーケース２２の材質はアルミニウムに限らず、樹脂でもよい。   The upper case 22 is made of aluminum, and a boss portion 25 is provided along the outer periphery thereof. A through hole 24 into which the rubber printing collar 30 is inserted is formed in the center of the boss 25 so as to extend in the vertical direction (see FIG. 2). The material of the upper case 22 is not limited to aluminum but may be resin.

段付きボルト６は、ボルト軸１０とボルト軸１０の長手方向の中央部に形成される円筒形の段部５と、ボルト軸１０の上端部に形成される断面四角形のスタット部２６とを備え、ボルト軸１０の下端部には、段付きボルト６をシリンダヘッド１４のねじ穴１５に螺合するためのねじ山２８が形成される。このねじ山２８をねじ穴１５に螺合させ、段付きボルト６を締付けることで、段付きボルト６の段部５の下面と側面が各々ロアーケース１８の凹部２１の下面と側面とに当接し、ロアーケース１８がシリンダヘッド１４に強固に締付・固定される。段付きボルト６の締付は、段付きボルト６のスタット部２６に締付工具を係合させることにより行われる。なお、スタット部２６の断面形状は、これに限らず、締付工具により段付きボルト６の締付けを行える形状であればよく、例えば、六角形や、長円形でもよい。また、ロアーケース１８にアッパーケース２２を載置した際にアッパーケース２２より上方に突出する、ボルト軸１０の部分には、ナット１２を螺合するためのねじ山２９が形成される。ボルト軸１０にラバー焼付カラー３０を嵌合させると共に、ラバー焼付カラー３０をアッパーケース２２の貫通孔２４に挿入し、ナット１２をねじ山２９に締付けることで、アッパーケース２２がロアーケース１８に固定される。   The stepped bolt 6 includes a bolt shaft 10, a cylindrical step portion 5 formed at the center in the longitudinal direction of the bolt shaft 10, and a stat portion 26 having a rectangular cross section formed at the upper end portion of the bolt shaft 10. A thread 28 for screwing the stepped bolt 6 into the screw hole 15 of the cylinder head 14 is formed at the lower end of the bolt shaft 10. By screwing the thread 28 into the screw hole 15 and tightening the stepped bolt 6, the lower surface and the side surface of the stepped portion 5 of the stepped bolt 6 come into contact with the lower surface and the side surface of the recess 21 of the lower case 18, respectively. The lower case 18 is firmly tightened and fixed to the cylinder head 14. The tightening of the stepped bolt 6 is performed by engaging a tightening tool with the stat portion 26 of the stepped bolt 6. The cross-sectional shape of the stat portion 26 is not limited to this, and any shape that can tighten the stepped bolt 6 with a tightening tool may be used. For example, a hexagonal shape or an oval shape may be used. Further, a thread 29 for screwing the nut 12 is formed in a portion of the bolt shaft 10 that protrudes upward from the upper case 22 when the upper case 22 is placed on the lower case 18. The rubber baking collar 30 is fitted to the bolt shaft 10, the rubber baking collar 30 is inserted into the through hole 24 of the upper case 22, and the nut 12 is fastened to the screw thread 29, so that the upper case 22 is fixed to the lower case 18. Is done.

ラバー焼付カラー３０は、座部３１および胴部３２からなるカラー部３４と、座部３１の下面から胴部３２の中央部までを覆うようにカラー部３４に焼き付けられるラバー部３５とからなる。アッパーケース２２をボルト軸１０に挿入し、ラバー焼付カラー３０を嵌入すると共にボルト軸１０に螺合されるナット１２を締付けることで、アッパーケース２２にラバー焼付カラー３０のラバー部３５が当接し、段付きボルト６からアッパーケース２２へ伝わる振動が遮断される。さらに、カラー部３４の最下端部が、段付きボルト６の段部５の上面と当接することにより、ラバー部３５の変形・つぶれ代を調整できる。   The rubber printing collar 30 includes a collar portion 34 including a seat portion 31 and a body portion 32, and a rubber portion 35 that is baked on the collar portion 34 so as to cover the lower surface of the seat portion 31 to the center portion of the body portion 32. The upper case 22 is inserted into the bolt shaft 10, the rubber baking collar 30 is inserted, and the nut 12 screwed into the bolt shaft 10 is tightened, so that the rubber portion 35 of the rubber baking collar 30 contacts the upper case 22. Vibration transmitted from the stepped bolt 6 to the upper case 22 is blocked. Furthermore, when the lowermost end portion of the collar portion 34 abuts on the upper surface of the step portion 5 of the stepped bolt 6, the deformation / crushed allowance of the rubber portion 35 can be adjusted.

次に、本形態の振動抑制締結構造の作用について説明する。   Next, the effect | action of the vibration suppression fastening structure of this form is demonstrated.

ロアーケース１８は段付きボルト６の段部５とシリンダヘッド１４との間に挟み込まれ、さらに、強固な支持剛性が得られるように、段付きボルト６のねじ山２８がシリンダヘッド１４のねじ穴１５に締付けられる。   The lower case 18 is sandwiched between the step portion 5 of the stepped bolt 6 and the cylinder head 14, and the thread 28 of the stepped bolt 6 is screwed into the screw hole of the cylinder head 14 so as to obtain strong support rigidity. Tightened to 15.

一方、アッパーケース２２とロアーケース１８との間にゴムパッキン８が介され、アッパーケース２２と段付きボルト６との間にラバー焼付カラー３０のラバー部３５が介されることで、アッパーケース２２が浮かし構造により固定され、段付きボルト６およびロアーケース１８からアッパーケース２２に伝達する振動が遮断される。さらに、浮かし構造の効果が発揮されるように、段付きボルト６のねじ山２９にナット１２が締付けられる。   On the other hand, the rubber packing 8 is interposed between the upper case 22 and the lower case 18, and the rubber portion 35 of the rubber baking collar 30 is interposed between the upper case 22 and the stepped bolt 6. It is fixed by the floating structure, and the vibration transmitted from the stepped bolt 6 and the lower case 18 to the upper case 22 is cut off. Further, the nut 12 is fastened to the thread 29 of the stepped bolt 6 so that the effect of the floating structure is exhibited.

つまり、段付きボルト６のねじ山２８を、シリンダヘッド１４のねじ穴１５に締付ける力を調整することで、ロアーケース１８の締付力が調整可能となり、また、段付きボルト６のねじ山２９にナット１２を締付ける力を調整することで、アッパーケース２２の締付力が調整可能となる。これにより、ロアーケース１８とアッパーケース２２が各々に最適な締付力で締付・固定され、振動が効果的に抑制される。   In other words, the tightening force of the lower case 18 can be adjusted by adjusting the force with which the thread 28 of the stepped bolt 6 is tightened into the threaded hole 15 of the cylinder head 14, and the thread 29 of the stepped bolt 6 can be adjusted. By adjusting the force with which the nut 12 is tightened, the tightening force of the upper case 22 can be adjusted. As a result, the lower case 18 and the upper case 22 are fastened and fixed with the optimum fastening force for each, and vibration is effectively suppressed.

また、ロアーケース１８の凹部２１の底面が段付きボルト６の段部５の底面と当接することで、ロアーケース１８が広い断面積で締付けられ支持剛性が高まり、さらに、ロアーケース１８の凹部２１の側面が段付きボルト６の段部５の側面と当接することで、ロアーケース１８の水平方向の挙動が抑えられる。   Further, the bottom surface of the concave portion 21 of the lower case 18 abuts against the bottom surface of the step portion 5 of the stepped bolt 6, whereby the lower case 18 is tightened with a wide cross-sectional area and the support rigidity is increased, and the concave portion 21 of the lower case 18 is further increased. The side surface of the lower case 18 comes into contact with the side surface of the stepped portion 5 of the stepped bolt 6, whereby the horizontal behavior of the lower case 18 is suppressed.

図３は、シリンダヘッド１４とヘッドカバー１７を締結する構造として、本発明の振動抑制締結構造と従来の振動抑制締結構造を各々用いた際の、エンジンから発生する騒音の各周波数における音圧レベルの測定結果を示す。測定にあたって、測定位置は、エンジンの上方約１ｍとし、またエンジン回転数は１０８０ｒｐｍとした。図３に示すように、本発明の振動抑制締結構造を用いた場合、従来の振動抑制締結構造を用いた場合に比べて、低音可聴域の周波数約６００Ｈｚから約２０００Ｈｚの帯域で、音圧レベルが約２ｄＢＡ低減した。   FIG. 3 shows the sound pressure level at each frequency of noise generated from the engine when the vibration suppression fastening structure of the present invention and the conventional vibration suppression fastening structure are used as the structure for fastening the cylinder head 14 and the head cover 17, respectively. The measurement results are shown. In the measurement, the measurement position was about 1 m above the engine, and the engine speed was 1080 rpm. As shown in FIG. 3, when the vibration suppression fastening structure of the present invention is used, the sound pressure level is lower in the frequency range of about 600 Hz to about 2000 Hz than in the case of using the conventional vibration suppression fastening structure. Decreased by about 2 dBA.

図４は、シリンダヘッド１４とヘッドカバー１７を締結する構造として、本発明の振動抑制締結構造と従来の振動抑制締結構造を各々用いた際の、エンジンの各回転数におけるヘッドカバー１７上部の振動レベルの測定結果を示す。図４に示すように、本発明の振動抑制締結構造を用いた場合、従来の振動抑制締結構造を用いた場合に比べて、エンジン回転数約１０００ｒｐｍから約２８０００ｒｐｍの広い領域で、振動レベルが２〜４ｄＢＡ程度低減した。   FIG. 4 shows the vibration level of the upper part of the head cover 17 at each engine speed when the vibration suppression fastening structure of the present invention and the conventional vibration suppression fastening structure are used as the structure for fastening the cylinder head 14 and the head cover 17, respectively. The measurement results are shown. As shown in FIG. 4, when the vibration suppression fastening structure of the present invention is used, the vibration level is 2 in a wide region from about 1000 rpm to about 28000 rpm as compared with the case of using the conventional vibration suppression fastening structure. Reduced by about 4 dBA.

このように本実施の形態に係る振動抑制締結構造は、段付きボルト６によりロアーケース１８を最適な締付力で固定し、段付きボルト６に螺合されるナット１２によりアッパーケース２２を最適な締付力で固定することで、ロアーケース１８とアッパーケース２２とに発生する振動を各々効果的に抑制することができるという効果と、段付きボルト６の段部５の下面をロアーケース１８の凹部２１の下面と当接させ、段付きボルト６を締付けることで、ロアーケース１８の締結断面積が広くなり、これによりロアーケース１８の支持剛性を高め振動拡大を抑制することができるという効果と、ロアーケース１８の凹部２１の側面と段付きボルト６の段部５の側面とを当接させることで、ロアーケース１８の水平方向の挙動を抑え振動拡大を抑制できるという効果と、アッパーケース２２を浮かし構造でロアーケース１８に固定することで、アッパーケース２２の振動を抑制することができるという効果がある。   As described above, in the vibration suppression fastening structure according to the present embodiment, the lower case 18 is fixed with the optimum tightening force by the stepped bolt 6, and the upper case 22 is optimized by the nut 12 screwed to the stepped bolt 6. By fixing with a small tightening force, the vibration generated in the lower case 18 and the upper case 22 can be effectively suppressed, and the lower surface of the stepped portion 5 of the stepped bolt 6 is connected to the lower case 18. The lower case 18 is brought into contact with the lower surface of the recess 21 and the stepped bolt 6 is tightened to increase the fastening cross-sectional area of the lower case 18, thereby increasing the support rigidity of the lower case 18 and suppressing the expansion of vibration. And the side surface of the recessed portion 21 of the lower case 18 and the side surface of the stepped portion 5 of the stepped bolt 6 are brought into contact with each other, thereby suppressing the horizontal behavior of the lower case 18 and suppressing vibration expansion. And effect of, by fixing to the lower case 18 by the structure floated upper case 22, there is an effect that it is possible to suppress the vibration of the upper case 22.

さらに、これらの効果により振動を抑制することで、振動に起因する騒音を低減できるという効果がある。   Furthermore, by suppressing the vibration by these effects, there is an effect that the noise caused by the vibration can be reduced.

なお、これまで、段付きボルト６の段部５を収納するための凹部２１を、ロアーケース１８に形成する実施の形態で説明したが、本発明はこの形態において限定されず、凹部２１をアッパーケース２２の下部に形成してもよい。この場合、段付きボルト６の振動をアッパーケース２２に伝えないようにするために、アッパーケース２２の凹部２１と段付きボルト６の段部５が当接しないように間隔を設けて凹部５を形成する。   Heretofore, the embodiment has been described in which the concave portion 21 for accommodating the step portion 5 of the stepped bolt 6 is formed in the lower case 18, but the present invention is not limited to this embodiment, and the concave portion 21 is upper. You may form in the lower part of case 22. FIG. In this case, in order to prevent the vibration of the stepped bolt 6 from being transmitted to the upper case 22, the concave portion 5 is provided with a gap so that the concave portion 21 of the upper case 22 and the stepped portion 5 of the stepped bolt 6 do not contact each other. Form.

この実施の形態においても、騒音と振動が、本発明の振動抑制締結構造と同様に抑制される。   Also in this embodiment, noise and vibration are suppressed similarly to the vibration suppression fastening structure of the present invention.

本実施の形態の振動抑制締結構造の構成図を示す。The block diagram of the vibration suppression fastening structure of this Embodiment is shown. シリンダヘッドとヘッドカバーの構成図を示す。The block diagram of a cylinder head and a head cover is shown. 本発明の振動抑制締結構造と従来の振動抑制締結構造の各々を用い、シリンダヘッドとヘッドカバーを締結した場合の音圧レベルの測定結果を示す。The measurement result of the sound pressure level at the time of fastening a cylinder head and a head cover using each of the vibration suppression fastening structure of the present invention and the conventional vibration suppression fastening structure is shown. 本発明の振動抑制締結構造と従来の振動抑制締結構造の各々を用い、シリンダヘッドとヘッドカバーを締結した場合の振動レベルの測定結果を示す。The measurement result of the vibration level at the time of fastening a cylinder head and a head cover using each of the vibration suppression fastening structure of this invention and the conventional vibration suppression fastening structure is shown. 従来の振動抑制締結構造の構成図を示す。The block diagram of the conventional vibration suppression fastening structure is shown.

符号の説明Explanation of symbols

５ 段部
６ 段付きボルト
１０ ボルト軸
１２ ナット
１４ シリンダヘッド（被締結部材、基体）
１７ シリンダカバー
１８ ロアーケース（第１締結部材）
２１ 凹部
２２ アッパーケース（第２締結部材）
３０ ラバー焼付カラー（ラバー部材）
5 step portion 6 stepped bolt 10 bolt shaft 12 nut 14 cylinder head (fastened member, base)
17 Cylinder cover 18 Lower case (first fastening member)
21 recess 22 upper case (second fastening member)
30 Rubber printing collar (rubber material)

Claims (4)

被締結部材である基体上に第１締結部材と第２締結部材を載置し、これら締結部材を上記基体に締付・固定する締結構造において、上記基体に上記第１締結部材を、長手方向の中間部に段部を有する段付きボルトで締結・固定し、その段部上に、ボルト軸を挿通するように上記第２締結部材を載置し、上記ボルト軸にラバー部材を介してナットを螺合して上記第２締結部材を締付・固定することを特徴とする振動抑制締結構造。   In a fastening structure in which a first fastening member and a second fastening member are placed on a base body to be fastened, and the fastening members are fastened and fixed to the base body, the first fastening member is placed on the base body in the longitudinal direction. Fastened and fixed with a stepped bolt having a stepped portion in the middle portion thereof, and the second fastening member is placed on the stepped portion so as to insert the bolt shaft, and the nut is inserted into the bolt shaft through a rubber member. A vibration-suppressing fastening structure, wherein the second fastening member is fastened and fixed by screwing together. 上記基体は、シリンダヘッドであり、上記締結部材は、上記第１締結部材としてのロアーケースと、上記第２締結部材としてのアッパーケースからなるヘッドカバーであり、かつ上記ラバー部材がラバー焼付カラーである請求項１記載の振動抑制締結構造。   The base is a cylinder head, the fastening member is a head cover including a lower case as the first fastening member and an upper case as the second fastening member, and the rubber member is a rubber printing collar. The vibration suppressing fastening structure according to claim 1. 上記ロアーケースには、上記段付きボルトの段部を回転可能かつ密に収容する凹部が形成される請求項２記載の振動抑制締結構造。   The vibration suppressing fastening structure according to claim 2, wherein the lower case is formed with a recess that rotatably and densely accommodates the stepped portion of the stepped bolt. 上記アッパーケースには、上記段付きボルトの段部を回転可能に収容する凹部が形成される請求項２記載の振動抑制締結構造。
The vibration suppression fastening structure according to claim 2, wherein the upper case is formed with a recess that rotatably accommodates the stepped portion of the stepped bolt.
JP2003416691A 2003-12-15 2003-12-15 Vibration suppression fastening structure Expired - Fee Related JP4281540B2 (en)

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WO2011076959A1 (en) * 2009-12-23 2011-06-30 Amadeo Marti Carbonell, S.A. Device for assembling the cylinder head of an engine
JP2013241949A (en) * 2012-05-17 2013-12-05 Isuzu Motors Ltd Vibration-proof structure
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CN106894915A (en) * 2017-03-24 2017-06-27 中国北方发动机研究所(天津) A kind of variable cross-section engine body sutures bolt arrangement and its assembly technology
CN107061044A (en) * 2017-03-24 2017-08-18 中国北方发动机研究所(天津) A kind of antifatigue suture texture of diesel engine body and its assembly technology
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JP2010138726A (en) * 2008-12-09 2010-06-24 Toyota Boshoku Corp Fixing construction of composite member
US8297900B2 (en) 2008-12-09 2012-10-30 Toyota Boshoku Kabushiki Kaisha Composite member fixing structure
WO2011076959A1 (en) * 2009-12-23 2011-06-30 Amadeo Marti Carbonell, S.A. Device for assembling the cylinder head of an engine
JP2013241949A (en) * 2012-05-17 2013-12-05 Isuzu Motors Ltd Vibration-proof structure
CN106837981A (en) * 2017-03-24 2017-06-13 中国北方发动机研究所(天津) A kind of embedded engine body suture bolt arrangement and its assembly technology
CN106894915A (en) * 2017-03-24 2017-06-27 中国北方发动机研究所(天津) A kind of variable cross-section engine body sutures bolt arrangement and its assembly technology
CN107061044A (en) * 2017-03-24 2017-08-18 中国北方发动机研究所(天津) A kind of antifatigue suture texture of diesel engine body and its assembly technology
CN115370474A (en) * 2022-08-24 2022-11-22 中船动力研究院有限公司 Fastening structure for connecting air cooler and scavenging box and diesel engine

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