JPH03239846A - Autotensioner - Google Patents

Autotensioner

Info

Publication number
JPH03239846A
JPH03239846A JP3460990A JP3460990A JPH03239846A JP H03239846 A JPH03239846 A JP H03239846A JP 3460990 A JP3460990 A JP 3460990A JP 3460990 A JP3460990 A JP 3460990A JP H03239846 A JPH03239846 A JP H03239846A
Authority
JP
Japan
Prior art keywords
eccentric member
movable eccentric
sliding surface
fixed
friction sliding
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.)
Pending
Application number
JP3460990A
Other languages
Japanese (ja)
Inventor
Kazuo Ide
賀津雄 井手
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.)
Koyo Seiko Co Ltd
Original Assignee
Koyo Seiko Co 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 Koyo Seiko Co Ltd filed Critical Koyo Seiko Co Ltd
Priority to JP3460990A priority Critical patent/JPH03239846A/en
Publication of JPH03239846A publication Critical patent/JPH03239846A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F02B67/06—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus driven by means of chains, belts, or like endless members

Landscapes

  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

PURPOSE:To suppress rotational vibration by making either the external peripheral surface of a stationary member or the fitting surface of the movable eccentric member opposing to the external peripheral surface of the stationary member be high friction sliding surface. CONSTITUTION:A short column-like movable eccentric member 11 is eccentrically and rotatably fitted around a stationary member 10. A bushing 13 is fixed in the hole 12 of the eccentric member by press-fitting, and the stationary member 10 is fitted in the bushing 13. As a result, a high friction sliding surface 13a is formed on the internal peripheral surface of the bushing 13. The rotational vibration of an idler 17 and the movable eccentric member 11 are suppressed by the large static friction force between the viscous resistance(sheering resistance) of the high viscosity oil between the stationary member 10 and movable eccentric member 11 and high friction sliding surface 13a and the surface abutting on the sliding surface 13a. Thus, vibration suppress effect becomes excellent.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、オートテンショナ、さらに詳しくは、自動
車用エンジンのクランクシャフトのプーリとカムシャフ
トのプーリの間に掛けられたタイミングベルトなどの張
力を調節するオートテンショナに関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is used to adjust the tension of an autotensioner, more specifically, a timing belt placed between a crankshaft pulley and a camshaft pulley of an automobile engine. Regarding auto tensioners.

従来の技術と発明の課題 自動車用エンジンでは、クランクシャフトとカムシャフ
トを同期させて回転させるためにタイミングベルトが使
用されており、その張力調節用としてオートテンショナ
が開発されている。BACKGROUND OF THE INVENTION In automobile engines, a timing belt is used to synchronize the rotation of a crankshaft and a camshaft, and an autotensioner has been developed to adjust the tension of the timing belt.

この種のオートテンショナの１例として、エンジンブロ
ックなどの固定部分に固定される円柱状の固定部材と、
固定部材の周囲に偏心状にかつ回転自在に嵌合された円
柱状の可動偏心部材と、可動偏心部材の外側に回転自在
に取付けられかつベルトに接触するアイドラと、アイド
ラがベルトに圧接する方向に上記可動偏心部材を付勢す
るばねとを備えたものが知られていた。An example of this type of auto tensioner is a cylindrical fixing member that is fixed to a fixed part such as an engine block;
A cylindrical movable eccentric member eccentrically and rotatably fitted around the fixed member, an idler rotatably attached to the outside of the movable eccentric member and in contact with the belt, and a direction in which the idler comes into pressure contact with the belt. A device equipped with a spring that biases the movable eccentric member is known.

しかしながら、このオートテンショナでは、エンジンの
回転変動にともなうベルトの張力変動により、アイドラ
および可動偏心部材が振動し、固定部材および可動偏心
部材の摺動面が摩耗してベルトの張力調節機能が短期間
で低下するという問題があった。However, with this autotensioner, the idler and movable eccentric member vibrate due to belt tension fluctuations caused by changes in engine rotation, and the sliding surfaces of the fixed member and movable eccentric member wear out, causing the belt tension adjustment function to be lost for a short period of time. There was a problem that it decreased.

そこで、このような問題を解決し、ベルトの張力変動に
よって共振しないように、ダンパ機構を内蔵したものが
多数提案されており、その１例として、上記固定部材と
上記可動偏心部材の相互に回転する部分の隙間に高粘度
の油が介在させられているものが知られている（特開昭
６３−４７５５１２号参照）。しかしながら、このオー
トテンショナによっても、ベルトの張力変動による共振
を抑制するが十分ではないという問題がある。Therefore, in order to solve this problem and prevent resonance due to tension fluctuations in the belt, a number of damper mechanisms have been proposed. It is known that high viscosity oil is interposed in the gap between the parts (see JP-A-63-475512). However, although this autotensioner suppresses resonance due to belt tension fluctuations, there is a problem in that it is not sufficient.

この発明の目的は、上記の問題を解決したオートテンシ
ョナを提供することにある。An object of the present invention is to provide an autotensioner that solves the above problems.

課題を解決するための手段 この発明によるオートテンショナは、 固定部分に固定される円柱状の固定部材と、固定部材の
外周面に偏心状にかつ回転自在に嵌合された円柱状の可
動偏心部材と、可動偏心部材の外側に回転自在に取付け
られてベルトに接触するアイドラと、アイドラがベルト
に圧接する方向に上記可動偏心部材を付勢するばねとを
備えており、上記固定部材と上記可動偏心部材の相互に
回転する部分の隙間に高粘度の油が介在させられている
オートテンショナであって、上記固定部材の外周面およ
び該外周面に対向する上記可動偏心部材の嵌合面のうち
いずれか一方が高摩擦摺動面となされているものである
。Means for Solving the Problems The autotensioner according to the present invention includes: a cylindrical fixed member fixed to a fixed part; and a cylindrical movable eccentric member eccentrically and rotatably fitted to the outer peripheral surface of the fixed member. an idler that is rotatably attached to the outside of the movable eccentric member and contacts the belt; and a spring that biases the movable eccentric member in a direction in which the idler comes into pressure contact with the belt; An autotensioner in which high viscosity oil is interposed in a gap between mutually rotating parts of an eccentric member, the outer circumferential surface of the fixed member and the fitting surface of the movable eccentric member facing the outer circumferential surface. Either one is a high friction sliding surface.

上記オートテンショナにおいて、上記固定部材の外周面
および該外周面に対向する上記可動偏心部材の嵌合面の
うちいずれか一方に、多孔質金属層と、該金属層の一部
が表面に露出するように多孔質金属層の空隙を埋める固
体潤滑材とからなる層が形成され、この層の表面が高摩
擦摺動面となされているのがよい。In the above autotensioner, a porous metal layer and a portion of the metal layer are exposed on either one of the outer peripheral surface of the fixed member and the fitting surface of the movable eccentric member opposite to the outer peripheral surface. It is preferable that a layer consisting of a solid lubricant fill the voids in the porous metal layer be formed, and the surface of this layer be a high friction sliding surface.

また、上記において、油の粘度および高摩擦摺動面の摩
擦係数は、ベルトなどの振動の特性、固定部材および可
動偏心部材の形状、寸法などを考慮して決定される。Furthermore, in the above, the viscosity of the oil and the coefficient of friction of the high friction sliding surface are determined by taking into consideration the vibration characteristics of the belt, etc., the shape and dimensions of the fixed member and the movable eccentric member, and the like.

作　　　用 エンジンの回転変動にともなうベルトの張力変動による
アイドラおよび可動偏心部材の回転振動は、固定部材と
可動偏心部材の間にある高粘度の油の粘性抵抗（剪断抵
抗）および上記高摩擦摺動面とこれに接する面との間の
大きな静摩擦力により抑制される。The rotational vibration of the idler and movable eccentric member due to belt tension fluctuations due to rotational fluctuations of the engine is caused by the viscous resistance (shearing resistance) of the high viscosity oil between the stationary member and the movable eccentric member and the high friction sliding mentioned above. It is suppressed by the large static friction force between the surface and the surface in contact with it.

実　　施　　例 以下、図面を参照して、この発明を自動車用エンジンの
クランクシャフトとカムシャフトの間に掛けられたタイ
ミングベルトに適用した実施例を説明する。Embodiments Hereinafter, embodiments in which the present invention is applied to a timing belt placed between a crankshaft and a camshaft of an automobile engine will be described with reference to the drawings.

第１図はこの発明によるオートテンショナの１実施例の
全体構成を示し、第２図および第３図はその要部を拡大
して示す。FIG. 1 shows the overall structure of an embodiment of an autotensioner according to the present invention, and FIGS. 2 and 3 show the main parts thereof in an enlarged manner.

エンジンの固定部分（たとえばエンジンブロック）に、
円柱状の固定部材（ｌＯ）が図示しない適当な手段によ
り固定されており、固定部材（工０）の周囲に、短円柱
状の可動偏心部材（１１）が偏心状にかつ回転自在に取
付けられている。偏心部材（１１）の穴（１２〉内にブ
ツシュ（１３〉が圧入により固定され、ブツシュ（１３
）内に固定部材（１０）が嵌められている。そして、ブ
ツシュ（１３）の内周面に高摩擦摺動面（１３ａ）が形
成されている。すなわち、第３図に示すように、ブツシ
ュ（Ｉ８）の内周面に、多孔質金属層（１４）と、該金
属層（１４）の一部が表面に露出するように多孔質金属
層〈１４）の空隙を埋める固体潤滑材（１５）とからな
る混合層（１６）が形成され、この混合層（１Ｂ）の表
面が高摩擦摺動面（１３ａ）となされている。混合層（
１６〉は、ブツシュ（１３）の内周面に、たとえば銅合
金からなる粉末を多孔質状に焼結することにより多孔質
金属層（１４〉を形成し、多孔質金属層（ｉ４）の空隙
内に、たとえばポリテトラフルオロエチレンなどの弗素
樹脂と鉛との混合物からなる固体潤滑材（Ｉ５）を含浸
するとともに、多孔質金属層（１４）の表面を所定厚さ
にわたって固体潤滑材（ｉ５）で覆い（第４図参照）、
表面の固体潤滑材（１５）層を、多孔質金属層（１４）
の一部が露出しかつ表面が平滑となるように切削するこ
とによって形成されている。高摩擦摺動面（１３ａ）の
摩擦係数はたとえば０．１１〜０．１７程度としておく
のがよい。そして、固定部材（ｌＯ）の外周面とブシュ
（１３）の高摩擦摺動面（１３ａ）との間に、たとえば
粘度が１００．０００ｃｓｔ　　（２５℃）以上のシリ
コーンオイル（０）が介在させられている。オイル（０
）は、固定部材（ｌＯ）とブツシュ（１３）との間に設
けられた図示しないシール手段によって封止されている
。Fixed parts of the engine (e.g. engine block)
A cylindrical fixing member (lO) is fixed by suitable means not shown, and a short cylindrical movable eccentric member (11) is eccentrically and rotatably attached around the fixing member (work 0). ing. The bush (13) is fixed in the hole (12) of the eccentric member (11) by press fitting, and the bush (13)
) is fitted with a fixing member (10). A high friction sliding surface (13a) is formed on the inner peripheral surface of the bush (13). That is, as shown in FIG. 3, a porous metal layer (14) and a porous metal layer (14) are formed on the inner peripheral surface of the bush (I8) so that a part of the metal layer (14) is exposed on the surface. A mixed layer (16) consisting of a solid lubricant (15) that fills the voids in the solid lubricant (14) is formed, and the surface of this mixed layer (1B) serves as a high-friction sliding surface (13a). Mixed layer (
16> forms a porous metal layer (14>) on the inner peripheral surface of the bush (13) by sintering powder made of, for example, a copper alloy into a porous shape, and fills the voids in the porous metal layer (i4). A solid lubricant (I5) made of a mixture of a fluororesin such as polytetrafluoroethylene and lead is impregnated into the interior of the porous metal layer (14), and the solid lubricant (i5) is applied to a predetermined thickness on the surface of the porous metal layer (14). (see Figure 4),
The solid lubricant (15) layer on the surface is replaced with the porous metal layer (14).
It is formed by cutting so that a part of the surface is exposed and the surface is smooth. The friction coefficient of the high friction sliding surface (13a) is preferably set to about 0.11 to 0.17, for example. For example, silicone oil (0) having a viscosity of 100.000 cst (25° C.) or more is interposed between the outer peripheral surface of the fixing member (lO) and the high friction sliding surface (13a) of the bushing (13). ing. Oil (0
) is sealed by a sealing means (not shown) provided between the fixing member (lO) and the bush (13).

偏心部材（１１）の周囲に、円筒状のアイドラ〈１７〉
が複数の球状転動体く１８〉を介して回転自在に取付け
られている。また、偏心部材（１１）には、ブラケット
（１９）が固定状に設けられ、このブラケットク１９〉
の先端とエンジンの固定部分との間に引張りコイルばね
（２０）が設けられ、これによりアイドラ（Ｉ７）がタ
イミングベルト（２Ｉ）の歯（２２）のムい面に押付け
られている。A cylindrical idler <17> is placed around the eccentric member (11).
is rotatably mounted via a plurality of spherical rolling elements (18). Further, a bracket (19) is fixedly provided on the eccentric member (11), and the bracket (19)
A tension coil spring (20) is provided between the tip of the timing belt (2I) and a fixed part of the engine, and this forces the idler (I7) against the outer surface of the teeth (22) of the timing belt (2I).

温度変化や使用などによりベルト（２１）が伸びて張力
が小さくなろうとすると、ばね（２０）によりブラケッ
ト（１９）を介して可動偏心部材（１１）が張力を増す
方向（第１図の時計方向）に回転し、アイドラ（１７）
を介して張力が所定の値に保持される。逆に、温度変化
などによりベルト（２１）が縮んで張力が大きくなろう
とすると、ばね（２０〉に抗して偏心部材（１１）が張
力を減らす方向（第１図の反時計方向）に回転し、張力
が所定の値に保持される。このとき、ベルト（２１）の
伸びまたは縮みは非常に緩やかであるから、偏心部材（
１１）の回転速度も非常に小さく、オイル（０）および
高摩擦摺動面（Ｈａ）が偏心部材（１１）の回転を拘束
することはない。これに対し、エンジンの回転変動にと
もなうベルト（２１）の張力変動によるアイドラ（１７
）および偏心部材（１１）の回転振動のような高周波振
動荷重に対しては、高摩擦摺動面（１３ａ）と固定部材
（１０）との間の高粘度のオイル（０）の粘性抵抗によ
りこれらが相互にすべりにくくなるとともに、固定部材
（１０）外周面とブツシュ（１３）の高摩擦摺動面（１
３ａ）との間の垂直荷重が大きくなって両面間の大きな
静摩擦力によりこれらが相互にすべりにくくなる。この
ため、偏心部材（１１）の回転すなわちアイドラ（１７
）の移動が抑制され、ダンパ効果が発揮される。When the belt (21) stretches due to temperature changes or usage, and the tension tends to decrease, the movable eccentric member (11) is moved by the spring (20) via the bracket (19) in the direction of increasing the tension (clockwise in Fig. 1). ) and idler (17)
The tension is maintained at a predetermined value via. On the other hand, if the belt (21) contracts due to temperature changes and the tension increases, the eccentric member (11) rotates in the direction of reducing the tension (counterclockwise in Figure 1) against the spring (20). The tension is maintained at a predetermined value.At this time, since the belt (21) expands or contracts very slowly, the eccentric member (
The rotational speed of the eccentric member (11) is also very small, and the oil (0) and the high friction sliding surface (Ha) do not restrict the rotation of the eccentric member (11). On the other hand, the idler (17
) and high-frequency vibration loads such as rotational vibration of the eccentric member (11), due to the viscous resistance of the high-viscosity oil (0) between the high-friction sliding surface (13a) and the fixed member (10). These become difficult to slip on each other, and the high friction sliding surface (1) of the outer peripheral surface of the fixing member (10) and the bush (13)
3a), and the large static friction force between the two surfaces makes it difficult for them to slide against each other. Therefore, the rotation of the eccentric member (11), that is, the idler (17)
) movement is suppressed and a damper effect is exerted.

上記実施例においては、可動偏心部材（１１）の穴（１
２）内にブツシュ（１３）が圧入され、ブツシュ（１３
ａ）の内周面に高摩擦摺動面（１３ａ）が形成されてい
るが、固定部材（ｌＯ）の周囲にブツシュ０３〉を圧入
し、ブツシュ（１３）の外周面に高摩擦摺動面を形成し
てもよい。また、可動偏心部材（ｌｌ）の穴（１２〉の
内周面および固定部材（１０）の外周面のうちのいずれ
かに直接高摩擦摺動面を形成してもよい。In the above embodiment, the hole (1) of the movable eccentric member (11) is
2) The bushing (13) is press-fitted into the bushing (13).
A high-friction sliding surface (13a) is formed on the inner circumferential surface of a), but the bushing 03> is press-fitted around the fixed member (lO), and the high-frictional sliding surface (13a) is formed on the outer circumferential surface of the bushing (13). may be formed. Alternatively, a high-friction sliding surface may be formed directly on either the inner circumferential surface of the hole (12>) of the movable eccentric member (ll) or the outer circumferential surface of the fixed member (10).

なお、この発明によるオートテンショナは、自動車のエ
ンジンのタイミングベルト以外のベルトにももちろん適
用できる。Note that the autotensioner according to the present invention can of course be applied to belts other than the timing belt of an automobile engine.

発明の効果 この発明のベルト用オートテンショナによれば、上述の
ようにして、アイドラおよび可動偏心部材の振動は、固
定部材と可動偏心部材の間にある高粘度の油の粘性抵抗
（剪断抵抗）および上記高摩擦摺動面とこれに接する面
との間の大きな静摩擦力により抑制されるので、上記振
動抑制効果が優れたものとなる。Effects of the Invention According to the belt autotensioner of the present invention, as described above, the vibration of the idler and the movable eccentric member is caused by the viscous resistance (shearing resistance) of the high viscosity oil between the fixed member and the movable eccentric member. Since the vibration is suppressed by the large static friction force between the high-friction sliding surface and the surface in contact with it, the vibration suppression effect is excellent.

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

第１図はこの発明の実施例を示すオートテンショナの部
分切欠き正面図、第２図は第１図の部分拡大図、第３図
は第２図の部分拡大図、第４図はブツシュの内周面に高
摩擦摺動面を形成する途中の状態を示す第３図相当の図
である。 （ｌＯ）・・・固定部材、（１１）・・・可動偏心部材
、（１３ａ）・・・高摩擦摺動面、（１７）・・・アイ
ドラ、（１９〉・・・引張りコイルばね、（０）・・・
オイル。 以上 第１図 第４図Fig. 1 is a partially cutaway front view of an autotensioner showing an embodiment of the present invention, Fig. 2 is a partially enlarged view of Fig. 1, Fig. 3 is a partially enlarged view of Fig. 2, and Fig. 4 is a partially enlarged view of the bushing. FIG. 4 is a diagram corresponding to FIG. 3 showing a state in the middle of forming a high-friction sliding surface on the inner circumferential surface. (lO)...Fixed member, (11)...Movable eccentric member, (13a)...High friction sliding surface, (17)...Idler, (19>...Tension coil spring, ( 0)...
oil. Above Figure 1 Figure 4

Claims (2)

【特許請求の範囲】[Claims] （１）固定部分に固定される円柱状の固定部材と、固定
部材の外周面に偏心状にかつ回転自在に嵌合された円柱
状の可動偏心部材と、可動偏心部材の外側に回転自在に
取付けられてベルトに接触するアイドラと、アイドラが
ベルトに圧接する方向に上記可動偏心部材を付勢するば
ねとを備えており、上記固定部材と上記可動偏心部材の
相互に回転する部分の隙間に高粘度の油が介在させられ
ているオートテンショナであつて、上記固定部材の外周
面および該外周面に対向する上記可動偏心部材の嵌合面
のうちいずれか一方が高摩擦摺動面となされているオー
トテンショナ。(1) A cylindrical fixed member fixed to the fixed part, a cylindrical movable eccentric member eccentrically and rotatably fitted to the outer peripheral surface of the fixed member, and a cylindrical movable eccentric member rotatably fitted to the outside of the movable eccentric member. It includes an idler that is attached and comes into contact with the belt, and a spring that biases the movable eccentric member in a direction in which the idler comes into pressure contact with the belt. An autotensioner in which high-viscosity oil is interposed, and either one of the outer circumferential surface of the fixed member and the fitting surface of the movable eccentric member opposing the outer circumferential surface is a high-friction sliding surface. Auto tensioner. （２）上記固定部材の外周面および該外周面に対向する
上記可動偏心部材の嵌合面のうちいずれか一方に、多孔
質金属層と、該金属層の一部が表面に露出するように多
孔質金属層の空隙を埋める固体潤滑材とからなる層が形
成され、この層の表面が高摩擦摺動面となされている請
求項（１）記載のオートテンショナ。(2) A porous metal layer is provided on either the outer circumferential surface of the fixed member and the fitting surface of the movable eccentric member that faces the outer circumferential surface, and a portion of the metal layer is exposed to the surface. 2. The autotensioner according to claim 1, wherein a layer is formed of a solid lubricant that fills the voids in the porous metal layer, and the surface of this layer is a high-friction sliding surface.
JP3460990A 1990-02-15 1990-02-15 Autotensioner Pending JPH03239846A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3460990A JPH03239846A (en) 1990-02-15 1990-02-15 Autotensioner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3460990A JPH03239846A (en) 1990-02-15 1990-02-15 Autotensioner

Publications (1)

Publication Number Publication Date
JPH03239846A true JPH03239846A (en) 1991-10-25

Family

ID=12419109

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3460990A Pending JPH03239846A (en) 1990-02-15 1990-02-15 Autotensioner

Country Status (1)

Country Link
JP (1) JPH03239846A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4320272A1 (en) * 1992-06-18 1993-12-23 Tsubakimoto Chain Co Power transmission device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4320272A1 (en) * 1992-06-18 1993-12-23 Tsubakimoto Chain Co Power transmission device
DE4320272C2 (en) * 1992-06-18 1998-07-09 Tsubakimoto Chain Co Power transmission device

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