JPH0643478U

JPH0643478U - Flexible pipe

Info

Publication number: JPH0643478U
Application number: JP3486192U
Authority: JP
Inventors: 英人三矢
Original assignee: Sango Co Ltd
Current assignee: Sango Co Ltd
Priority date: 1992-05-26
Filing date: 1992-05-26
Publication date: 1994-06-10

Abstract

(57)【要約】【目的】ベローズ管１１の剛性を低くし、フレキシブ
ルパイプの振動吸収性を高め、振動によるサポート等か
らの異音の発生を防止し、かつ早期折損の防止を図る。【構成】ベローズ管１１の山部１１ｄにおける軸方向
への折曲半径Ｒ₃を、谷部１１ｅにおける軸方向への折
曲半径Ｒ₄より小さく設定した。 (57) [Abstract] [Purpose] The rigidity of the bellows pipe 11 is reduced, the vibration absorption of the flexible pipe is enhanced, abnormal noise is prevented from being generated by a support or the like due to vibration, and early breakage is prevented. [Structure] The bending radius R ₃ of the bellows pipe 11 in the peak portion 11d in the axial direction is set to be smaller than the bending radius R ₄ of the valley portion 11e in the axial direction.

Description

[Detailed description of the device]

【０００１】[0001]

[Industrial applications]

本考案は内燃機関の排気系等に使用されるフレキシブルパイプに関する。 The present invention relates to a flexible pipe used for an exhaust system of an internal combustion engine.

【０００２】[0002]

[Prior art]

従来、内燃機関の排気系において、エンジンのローリングで発生した振動等を、排気系の下流部における部品に伝達しないように吸収するために、図４に示すように、エンジン１に連結した上流側排気管２と下流側排気管３との途中にフレキシブルパイプ４を介在している。 Conventionally, in an exhaust system of an internal combustion engine, in order to absorb vibrations or the like generated by rolling of the engine so as not to be transmitted to parts in a downstream portion of the exhaust system, as shown in FIG. A flexible pipe 4 is interposed between the exhaust pipe 2 and the downstream exhaust pipe 3.

【０００３】このフレキシブルパイプ３として、従来、図５及び図６に示すように、上流側排気管２と下流側排気管３との間に蛇腹状のベローズ管５を架設し、更にその外周にアウターブレード６を設け、これらの両端をクリンチバンド７，８にて両管２，３に締着したものがある。As the flexible pipe 3, conventionally, as shown in FIGS. 5 and 6, a bellows-shaped bellows pipe 5 is installed between an upstream exhaust pipe 2 and a downstream exhaust pipe 3, and the outer circumference thereof is further increased. There is an outer blade 6 provided at the both ends of which both ends are fastened to both pipes 2 and 3 by clinch bands 7 and 8.

【０００４】そして、前記ベローズ管５は、図５及び図６に示すように、軸方向への山部５ａの折曲半径Ｒ₁と谷部５ｂの折曲半径Ｒ₂との関係が、ほぼ同一か或いは谷部５ｂの折曲半径が大きいＲ₁≧Ｒ₂の関係になっている。[0004] Then, the bellows tube 5, as shown in FIGS. 5 and 6, the relationship between the bending radius R ₂ of the bending radius R ₁ and the trough portion 5b of the crests 5 a in the axial direction, The relationship is R ₁ ≧ R ₂ which is almost the same or has a large bending radius of the valley portion 5b.

【０００５】[0005]

[Problems to be solved by the device]

ところで、蛇腹状のベローズ管においては、一般に谷径がフレキシブルパイプ全体の曲げ剛性に関与することが知られている。 By the way, in a bellows tube having a bellows shape, it is generally known that the root diameter contributes to the bending rigidity of the entire flexible pipe.

【０００６】そのため、前記従来のように、Ｒ₁≧Ｒ₂の関係にあるものにおいては、谷部での発生応力が小さいことから、ベローズ管の屈曲性が小さく、振動吸収機能が弱い問題があった。Therefore, in the case of the relationship of R ₁ ≧ R ₂ as in the above-described conventional case, since the stress generated at the valley portion is small, the bellows tube has a small flexibility and the vibration absorption function is weak. there were.

【０００７】そのため、エンジンのローリングによる振動が下流側排気管３を支持するサポート９等の部品に伝達し、その部品から振動異音が発生したり、部品が早期に切損する問題があった。Therefore, the vibration due to the rolling of the engine is transmitted to a component such as the support 9 that supports the downstream side exhaust pipe 3, and there is a problem that abnormal noise is generated from the component or the component is damaged early. It was

【０００８】そこで本考案は、ベローズ管の山径を谷径より小さくして、振動吸収機能を向上させるフレキシブルパイプを提案し、前記の問題を解決するものである。Therefore, the present invention proposes a flexible pipe in which the peak diameter of the bellows pipe is made smaller than the valley diameter to improve the vibration absorbing function, and solves the above problem.

【０００９】[0009]

[Means for Solving the Problems]

本考案は前記の課題を解決するために、軸方向に屈曲する蛇腹状のベローズ管を使用したフレシキブルパイプにおいて、そのベローズ管（１１）の山部（１１ｄ）における軸方向への折曲半径（Ｒ₃）を、谷部（１１ｅ）における軸方向への折曲半径（Ｒ₄）より小さく設定したことを特徴とするものである。SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a flexible pipe using a bellows tube having a bellows shape that bends in an axial direction. It is characterized in that (R ₃ ) is set to be smaller than the bending radius (R ₄ ) in the valley portion (11e) in the axial direction.

【００１０】[0010]

[Action]

ベローズ管（１１）に振動負荷が作用すると、谷部（１１ｅ）の折曲半径（Ｒ ₄ ）より小さい径の山部（１１ｄ）に応力が集中し、ベローズ管（１１）の剛性が低下して、振動吸収性が大きくなる。 When a vibration load acts on the bellows pipe (11), the bending radius (R _Four ) Stress concentrates on the mountain portion (11d) having a smaller diameter, the rigidity of the bellows pipe (11) is reduced, and the vibration absorption is increased.

【００１１】[0011]

【Example】

図１及び図２に示す本考案の実施例について説明する。２は上流側排気管、３は下流側排気管、１０はフレキシブルパイプである。 An embodiment of the present invention shown in FIGS. 1 and 2 will be described. 2 is an upstream exhaust pipe, 3 is a downstream exhaust pipe, and 10 is a flexible pipe.

【００１２】１１はフレキシブルパイプ１１を構成するベローズ管で、主体部１１ａが蛇腹状に形成され、両端１１ｂ，１１ｃが前記両管２，３に嵌合連結されている。主体部１１ａにおける山部１１ｄの軸方向への折曲半径Ｒ₃は谷部１１ｅの折曲半径Ｒ₄よりも小さく定められており、その関係はＲ₃／Ｒ₄＝０．３〜０．８、すなわち、山部の半径Ｒ₃が谷部の半径Ｒ₃の３０％〜８０％の大きさに設定されている。Reference numeral 11 is a bellows tube that constitutes the flexible pipe 11, and a main body portion 11a is formed in a bellows shape, and both ends 11b and 11c are fitted and connected to the both tubes 2 and 3. Bending radius R ₃ in the axial direction of the peak portion 11d of the main body portion 11a is defined smaller than the bending radius R ₄ of the valley 11e, the relationship is R ₃ / R ₄ = 0.3 to 0.8, i.e., the radius R ₃ at the crest is set to a size of 30% to 80% of the radius R ₃ of the valley.

【００１３】１２はベローズ管１０の外周に設けたアウターブレードで、その両端１２ａ，１２ｂはベローズ管１１の両端１１ｂ，１１ｃの外面に重合されている。１３はベローズ管１１とアウターブレード１２の両端を両管２，３に締着するクリンチバンドである。Reference numeral 12 denotes an outer blade provided on the outer circumference of the bellows pipe 10, and both ends 12 a and 12 b thereof are superposed on the outer surfaces of both ends 11 b and 11 c of the bellows pipe 11. A clinch band 13 fastens both ends of the bellows pipe 11 and the outer blade 12 to the pipes 2 and 3.

【００１４】エンジンのローリング振動によって上流側排気管２が図１の軸線Ｘ−Ｘと直交するＹ−Ｙ方向に振動すると、フレキシブルパイプ１０は、その下流側排気管３との連結部を中心としてＹ−Ｙ線方向に屈曲振動する。When the upstream exhaust pipe 2 vibrates in the Y-Y direction orthogonal to the axis XX in FIG. 1 due to the rolling vibration of the engine, the flexible pipe 10 is centered on the connecting portion with the downstream exhaust pipe 3. Flexural vibration occurs in the YY line direction.

【００１５】このとき、山部１１ｄの半径Ｒ₃が谷部１１ｅの折曲半径Ｒ₄よりも小さいことにより、谷部１１ｅよりも山部１１ｄに応力が集中し、谷部１１ｅに発生する応力が緩和される。At this time, since the radius R ₃ of the ridge 11d is smaller than the bending radius R ₄ of the valley 11e, stress concentrates on the ridge 11d rather than the valley 11e, and is generated in the valley 11e. Stress is relieved.

【００１６】そのため、前記従来構造に比べて本考案のベローズ管１１の剛性は低下し、結果的にフレキシブルパイプ１０の剛性も小さくなる。山部１１ｄの折曲半径Ｒ₃と谷径１１ｅの折曲半径Ｒ₄との関係Ｒ₃／Ｒ₄と、山部最大発生応力及び曲げ剛性との相関関係を図３に示す。図中実線イは曲げ剛性を示し、点線ロは山部発生最大応力を示す。Therefore, the rigidity of the bellows pipe 11 of the present invention is lower than that of the conventional structure, and consequently the rigidity of the flexible pipe 10 is also low. Relationship R ₃ / R ₄ and bending radius R ₄ of the bent radius R ₃ and the root diameter 11e at the crest 11d, shown in FIG. 3 the correlation between the maximum generated stress and bending stiffness crest. In the figure, the solid line (a) shows the bending rigidity, and the dotted line (b) shows the maximum stress generated in the mountain portion.

【００１７】この相関関係から、Ｒ₃／Ｒ₄＝０．５３が最適値であり、この値で実験した結果、エンジンのローリング振動の吸収率が従来のものに比べて５０％増大した。From this correlation, R ₃ / R ₄ = 0.53 is the optimum value, and as a result of experimenting with this value, the absorption rate of the rolling vibration of the engine was increased by 50% as compared with the conventional one.

【００１８】尚、Ｒ₃／Ｒ₄が０．３〜０．８の値であっても、振動吸収率は、従来のものよりも増大するため、この範囲の値であっても効果を有する。Even if R ₃ / R ₄ is a value of 0.3 to 0.8, the vibration absorption rate is higher than that of the conventional one, so that a value in this range is also effective. .

【００１９】[0019]

[Effect of device]

以上のように本考案によれば、ベローズ管の剛性が低下してフレキシブルパイプの振動吸収性が従来のものと比較して向上するため、エンジンのローリングによる振動が下流側排気管部へ伝わりにくくなり、排気管のサポート等の部品からの異音の発生を減少させ、かつ早期切損の問題を起きにくくすることができる。 As described above, according to the present invention, the rigidity of the bellows pipe is reduced and the vibration absorption of the flexible pipe is improved as compared with the conventional one, so that the vibration due to the rolling of the engine is transmitted to the downstream side exhaust pipe part. It is possible to reduce the occurrence of abnormal noise from parts such as the exhaust pipe support and prevent the problem of early cutting loss from occurring easily.

[Brief description of drawings]

【図１】本考案の実施例を示す側断面図。FIG. 1 is a side sectional view showing an embodiment of the present invention.

【図２】同要部の拡大側断面図。FIG. 2 is an enlarged side sectional view of the main part.

【図３】山部径と谷部径の比率と山部最大発生応力と
曲げ剛性との関係を示す図。FIG. 3 is a view showing a relationship between a ratio of a peak diameter to a valley diameter, a peak maximum stress generated and a bending rigidity.

【図４】フレキシブルパイプを備えた排気系の一部を
示す図。FIG. 4 is a diagram showing a part of an exhaust system including a flexible pipe.

【図５】従来のフレキシブルパイプを示す一部破断し
た側面図。FIG. 5 is a partially cutaway side view showing a conventional flexible pipe.

【図６】同要部の拡大側断面図。FIG. 6 is an enlarged side sectional view of the main part.

[Explanation of symbols]

１０フレキシブルパイプ１１ベローズ管１１ｄ山部１１ｅ谷部Ｒ₃，Ｒ₄ 半径10 flexible pipe 11 bellows pipe 11d mountain part 11e valley part R ₃ , R ₄ radius

Claims

[Scope of utility model registration request]

In frame Shiki Bull pipe using 1. A bellows-shaped bellows pipe that is bent in the axial direction, the bending radius (R ₃₎ in the axial direction ridges in (11d) of the bellows tube (11), valleys A flexible pipe characterized by being set smaller than an axial bending radius (R ₄ ) in (11e).