JPS61266859A - Tension adjusting device of wrapping transmission means - Google Patents
Tension adjusting device of wrapping transmission meansInfo
- Publication number
- JPS61266859A JPS61266859A JP10395885A JP10395885A JPS61266859A JP S61266859 A JPS61266859 A JP S61266859A JP 10395885 A JP10395885 A JP 10395885A JP 10395885 A JP10395885 A JP 10395885A JP S61266859 A JPS61266859 A JP S61266859A
- Authority
- JP
- Japan
- Prior art keywords
- transmission means
- engine body
- tensioner
- tension
- linear expansion
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H7/00—Gearings for conveying rotary motion by endless flexible members
- F16H7/08—Means for varying tension of belts, ropes, or chains
- F16H2007/0863—Finally actuated members, e.g. constructional details thereof
- F16H2007/0874—Two or more finally actuated members
Landscapes
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は内燃機関の弁駆動用カム軸を駆動するための巻
掛は伝動手段に設ける張力調節装置に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a tension adjusting device provided in a winding transmission means for driving a valve driving camshaft of an internal combustion engine.
内燃機関の吸排気弁駆動用のカム軸を、クランク軸との
間に調時ベルト、チェノなどの巻掛は伝動手段を巻回さ
せて駆動するようにしたものがある。一方、このような
内燃機関の軽量化のため、シリンダブロック、シリンダ
ヘッドなどのエンジン本体をアルミニウム合金などの軽
合金で形成したものがある。ところが、このような軽合
金は、線膨張係数が上記巻掛は伝動手段の材料に比べて
著しく大きいため、エンジン。There is an internal combustion engine in which a camshaft for driving intake and exhaust valves is driven by a transmission means wound around a timing belt, chino, etc. between the crankshaft and the camshaft. On the other hand, in order to reduce the weight of such internal combustion engines, some engines have engine bodies such as cylinder blocks and cylinder heads made of light alloys such as aluminum alloys. However, such light alloys have a significantly larger coefficient of linear expansion than the material of the transmission means, so they cannot be used in engines.
本体の温度が上昇したとき、軸間距離の増大によって巻
掛は伝動手段の張力が著しく増大し、騒音を発生したり
、巻掛は伝動手段自身の寿命を短縮したりする原因にな
る。When the temperature of the main body increases, the tension in the transmission means increases significantly due to the increase in the distance between the shafts, causing noise and shortening the life of the transmission means itself.
本発明の目的は、線膨張係数の大きな軽合金型のエンジ
ン本体を有しながら、巻掛は伝動手段を常に適性な張力
に維持することができる巻掛は伝動手段の張力調節装置
を提供することにある。An object of the present invention is to provide a tension adjustment device for a winding transmission means that can always maintain an appropriate tension in the winding transmission means while having a light alloy type engine body with a large coefficient of linear expansion. There is a particular thing.
上記目的を達成する本発明は、エンジン本体を軽合金で
形成し、クランク軸と弁駆動用のカム軸との間に巻掛は
伝動手段を巻回した内燃機関において、前記巻掛は伝動
手段に押圧するテンショナを進退自在に設ける一方、前
記エンジン本体にこのエンジン本体とは線膨張係数が異
なる比較部材を連結し、この比較部材の他端を、前記テ
ンショナにその進退を許容可能に係合させたことを特徴
とするものである。To achieve the above object, the present invention provides an internal combustion engine in which an engine body is formed of a light alloy, and a transmission means is wound around a crankshaft and a camshaft for driving a valve, wherein the winding is a transmission means. A tensioner is provided to move forward and backward, and a comparison member having a linear expansion coefficient different from that of the engine body is connected to the engine body, and the other end of the comparison member is engaged with the tensioner so as to allow the tensioner to move forward and backward. It is characterized by the fact that
以下、本発明を図に示す実施例により説明する。 Hereinafter, the present invention will be explained with reference to embodiments shown in the drawings.
第１，２図に示す内燃機関において、１はシリンダブロ
ック、２はシリンダヘッドで、これらエンジン本体がと
もにアルミニウム合金などの軽合金によって形成されて
いる。シリンダヘッド１にはピストン３が嵌挿され、ピ
ストン３は連接棒４を介してクランク軸５を駆動するよ
うになっている。また、シリンダヘッド２に設けられた
燃焼室６には吸気弁７と排気弁８が設けられ、この吸気
弁７と排気弁８は、それぞれカム軸９と１０によって駆
動されるようになっている。In the internal combustion engine shown in FIGS. 1 and 2, 1 is a cylinder block, 2 is a cylinder head, and both of these engine bodies are made of a light alloy such as an aluminum alloy. A piston 3 is fitted into the cylinder head 1, and the piston 3 drives a crankshaft 5 via a connecting rod 4. Further, the combustion chamber 6 provided in the cylinder head 2 is provided with an intake valve 7 and an exhaust valve 8, and the intake valve 7 and the exhaust valve 8 are driven by camshafts 9 and 10, respectively. .
上記クランク軸５、カム軸９．１０の軸端には、歯車１
１，１２．１３がそれぞれ取りつけられ、これら歯車１
１，１２．１３に歯付きの調時ベルト１４が矢印方向へ
移動するように巻回されている。この調時ベルト１５は
、内部に補強コードなどの補強材が埋設されたゴム材か
ら形成され、その線膨張係数は上記エンジン本体の軽合
金に比べて著しく小さくなっている。A gear 1 is attached to the shaft end of the crankshaft 5 and camshaft 9.10.
1, 12, and 13 are respectively attached, and these gears 1
A toothed timing belt 14 is wound around 1, 12, and 13 so as to move in the direction of the arrow. The timing belt 15 is made of a rubber material with a reinforcing material such as a reinforcing cord embedded therein, and its coefficient of linear expansion is significantly smaller than that of the light alloy of the engine body.
このこの調時ベルト１５は、歯車１１と歯車１２との間
に、油ポンプなどの補機を駆動する歯車１５を噛合し、
クランク軸５の歯車１１から離れた弛み側に張力プーリ
１６をテンショナとして当接させている。さらに、歯車
１２と１５との間には、別のテンショナを構成する張力
プーリ１７を当接させている。This timing belt 15 meshes a gear 15 that drives an auxiliary machine such as an oil pump between the gear 11 and the gear 12.
A tension pulley 16 is brought into contact with the slack side of the crankshaft 5 away from the gear 11 as a tensioner. Furthermore, a tension pulley 17 constituting another tensioner is brought into contact between the gears 12 and 15.
上記張力プーリ１７は、シリンダブロック１の側面にボ
ルト１８によって揺動自在に枢支されたＬ字状のリンク
１９の一端に、回動自在に支持されている。このリンク
１９の他端には、ロンド状の比較部材２０の上端がビボ
フト状に係合し、その比較部材２０の下端は、シリンダ
ブロック１の側面にボルト２１を介して揺動自在に枢支
されている。上記比較部材２０は炭素繊維複合材やセラ
ミックなどから形成され、その線膨張係数は軽合金型の
エンジン本体のそれに比べ著しく小さくなっている。The tension pulley 17 is rotatably supported at one end of an L-shaped link 19 that is pivotably supported by a bolt 18 on the side surface of the cylinder block 1 . The other end of this link 19 is engaged with the upper end of a comparison member 20 in a round shape, and the lower end of the comparison member 20 is swingably supported on the side surface of the cylinder block 1 via a bolt 21. has been done. The comparison member 20 is made of carbon fiber composite material, ceramic, or the like, and its coefficient of linear expansion is significantly smaller than that of the light alloy type engine body.
上述した内燃機関において、エンジン本体の温度が上昇
すると、大きな線膨張係数に基づく熱膨張によってクラ
ンク軸５．カム軸９，１００相互間の距離は大きくなる
が、これに対し調時ベルト１４は線膨張係数が小さいた
め、上記軸間距離の増加はどに熱膨張はしない。そのた
め調時ベルト１４の張力は大きくなり、その張力は張力
プーリ１７を外側へ向けて押し出すように作用し、それ
によってリンク１９をボルト１８を中心に回動させよう
とするモーメントが作用する。In the above-mentioned internal combustion engine, when the temperature of the engine body rises, the crankshaft 5. Although the distance between the camshafts 9 and 100 increases, the timing belt 14 has a small coefficient of linear expansion, so the increase in the distance between the shafts does not cause any thermal expansion. Therefore, the tension in the timing belt 14 increases, and this tension acts to push the tension pulley 17 outward, thereby creating a moment that tends to rotate the link 19 about the bolt 18.
一方、このリンク１９の他端を支えている比較部材２０
は、線膨張係数がエンジン本体のそれよりも小さいため
、エンジン本体はどには熱膨張しない。そのため上記モ
ーメントの作用するリンク１９の保合端は比較部材２０
に追従して移動し、上記張力プーリ１７の外側への移動
を許容する。それによって調時ベルト１４の張力増大は
吸収され、はパ温度上昇前の張力水準を維持することが
できる。On the other hand, a comparison member 20 supporting the other end of this link 19
Since the coefficient of linear expansion is smaller than that of the engine body, the engine body does not thermally expand anywhere. Therefore, the retaining end of the link 19 on which the above moment acts is the comparative member 20.
, and allows the tension pulley 17 to move outward. As a result, the increase in tension in the timing belt 14 is absorbed, and the tension level before the temperature rise can be maintained.
なお、上述した装置では、比較部材２０の線膨張係数を
エンジン本体の線膨張係数よりも小さい材料にしである
が、これとは反対に線膨張係数の大きな材料にしてもよ
い。このように線膨張係数が大きい比較部材２０゛にす
る場合は、第１図に鎖線で示すように、リンク１９の端
部に対し上記実施例とは反対側の位置に係合させ、その
他端を同じようにボルト２１′を介してエンジン本体に
枢支するようにすればよい。このような連結によって、
上記実施例と同様にエンジン本体の温度上昇にかかわら
ず、調時ベルト１４の張力をはパ一定に維持することが
できる。In the above-described apparatus, the comparison member 20 is made of a material having a linear expansion coefficient smaller than that of the engine body, but on the contrary, it may be made of a material having a larger linear expansion coefficient. In the case of using the comparative member 20° having a large coefficient of linear expansion, as shown by the chain line in FIG. It is sufficient to similarly support the engine body via a bolt 21'. With such a connection,
As in the above embodiment, the tension of the timing belt 14 can be maintained constant regardless of the temperature rise of the engine body.
また、上記実施例では、カム軸を吸気弁と排気弁に対し
各別に設けたが、これを１本で共用する場合であっても
よい。Further, in the above embodiment, separate camshafts are provided for the intake valve and the exhaust valve, but a single camshaft may be used in common.
上述したように本発明は、エンジン本体を軽合金で形成
し、クランク軸と弁駆動用のカム軸との間に巻掛は伝動
手段を巻回した内燃機関において、前記巻掛は伝動手段
に押圧するテンショナを進退自在に設ける一方、前記エ
ンジン本体にこのエンジン本体とは線膨張係数が異なる
比較部材を連結じ、この比較部材の他端を、前記テンシ
ョナにその進退を許容可能に係合させたので、エンジン
本体の熱膨張に基づく巻掛は伝動手段の張力増加を、進
退自在のテンショナを介して上記比較部材によって吸収
することができる。したがって、軽合金製のエンジン本
体であっても、巻掛は伝動手段を常に適性な張力に維持
することができる。As described above, the present invention provides an internal combustion engine in which the engine body is made of a light alloy, and the winding is wound around the transmission means between the crankshaft and the camshaft for driving the valve, and the winding is around the transmission means. A pressing tensioner is provided to move forward and backward, and a comparison member having a coefficient of linear expansion different from that of the engine body is connected to the engine body, and the other end of the comparison member is engaged with the tensioner so as to allow the tensioner to move forward and backward. Therefore, an increase in the tension of the transmission means due to the thermal expansion of the engine body can be absorbed by the comparative member via the tensioner which can move forward and backward. Therefore, even if the engine body is made of light alloy, the winding can always maintain the transmission means at an appropriate tension.
第１図は本発明の実施例による張力調節装置を存するカ
ム軸駆動機構の正面図、第２図は同カム軸駆動機構を備
えた内燃機関の縦断面図である。
５・−クランク軸、 ９．１０・−カム軸、 １１
．１２．１３・・−歯車、 １４−・−調時ベルト（巻
掛は伝動手段）、 １７−・張力プーリ （テンショ
ナ）、 １９− リンク、 ２０．２０゜−・−比
較部材。FIG. 1 is a front view of a camshaft drive mechanism including a tension adjusting device according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of an internal combustion engine equipped with the same camshaft drive mechanism. 5.-crankshaft, 9.10.-camshaft, 11
．． 12.13...-gear, 14--timing belt (winding is transmission means), 17--tension pulley (tensioner), 19- link, 20.20°--comparison member.
Claims (1)
のカム軸との間に巻掛け伝動手段を巻回した内燃機関に
おいて、前記巻掛け伝動手段に押圧するテンショナを進
退自在に設ける一方、前記エンジン本体にこのエンジン
本体とは線膨張係数が異なる比較部材を連結し、この比
較部材の他端を、前記テンショナにその進退を許容可能
に係合させたことを特徴とする巻掛け伝動手段の張力調
節装置。In an internal combustion engine in which the engine body is formed of a light alloy and a winding transmission means is wound between a crankshaft and a camshaft for driving a valve, a tensioner for pressing the winding transmission means is provided so as to be movable forward and backward; A wrap-around transmission means, characterized in that a comparison member having a coefficient of linear expansion different from that of the engine body is connected to the engine body, and the other end of the comparison member is engaged with the tensioner so as to allow movement of the comparison member back and forth. tension adjustment device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10395885A JPS61266859A (en) | 1985-05-17 | 1985-05-17 | Tension adjusting device of wrapping transmission means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10395885A JPS61266859A (en) | 1985-05-17 | 1985-05-17 | Tension adjusting device of wrapping transmission means |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61266859A true JPS61266859A (en) | 1986-11-26 |
Family
ID=14367904
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10395885A Pending JPS61266859A (en) | 1985-05-17 | 1985-05-17 | Tension adjusting device of wrapping transmission means |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61266859A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0816716A1 (en) * | 1996-07-03 | 1998-01-07 | Ford Global Technologies, Inc. | Tensioning a drive belt |
| CN111336300A (en) * | 2020-02-21 | 2020-06-26 | 日照金慧科技信息咨询有限公司 | Device for adjusting water flow and water temperature of faucet based on light sensation control principle |
-
1985
- 1985-05-17 JP JP10395885A patent/JPS61266859A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0816716A1 (en) * | 1996-07-03 | 1998-01-07 | Ford Global Technologies, Inc. | Tensioning a drive belt |
| CN111336300A (en) * | 2020-02-21 | 2020-06-26 | 日照金慧科技信息咨询有限公司 | Device for adjusting water flow and water temperature of faucet based on light sensation control principle |
| CN111336300B (en) * | 2020-02-21 | 2020-11-27 | 抚州市圣航洁具有限公司 | Device for adjusting water flow and water temperature of faucet based on light sensation control principle |
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