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WO2017164123A1 - Chain power transmitting device - Google Patents

Chain power transmitting device Download PDF

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Publication number
WO2017164123A1
WO2017164123A1 PCT/JP2017/010938 JP2017010938W WO2017164123A1 WO 2017164123 A1 WO2017164123 A1 WO 2017164123A1 JP 2017010938 W JP2017010938 W JP 2017010938W WO 2017164123 A1 WO2017164123 A1 WO 2017164123A1
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WO
WIPO (PCT)
Prior art keywords
chain
guide
rollers
chain guide
roller
Prior art date
Application number
PCT/JP2017/010938
Other languages
French (fr)
Japanese (ja)
Inventor
聞倬 馬
Original Assignee
Ntn株式会社
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 Ntn株式会社 filed Critical Ntn株式会社
Publication of WO2017164123A1 publication Critical patent/WO2017164123A1/en

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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 
    • 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
    • F16H7/18—Means for guiding or supporting belts, ropes, or chains

Definitions

  • the present invention mainly relates to a chain transmission that transmits rotation of a crankshaft of an automobile engine to a camshaft.
  • a timing chain hereinafter simply referred to as “chain”
  • chain a timing chain
  • a swingable chain guide extending along the running direction of the chain is provided on one side of the chain, and the timing chain is tensioned by applying an adjustment force of the chain tensioner to the swing side end of the chain guide.
  • a chain guide is provided in the chain on the tension side of the chain so that the chain is fixed, and the chain travel is guided by the fixed chain guide to suppress fluttering.
  • both ends of a plurality of roller shafts arranged in a curved shape are supported by a synthetic resin guide base extending long in the running direction of the chain.
  • a chain guide has been proposed in which a roller comprising a roller bearing is rotatably supported by each of the plurality of roller shafts, and the chain is guided to run freely by the plurality of rollers.
  • the chain is guided by rolling of a plurality of rollers.
  • the guide by the rolling of the roller has the characteristics that the running resistance of the chain is small and the torque transmission loss is small.
  • the chain guide described in Patent Document 2 can reduce noise during running of the chain.
  • the winding angle of the chain on the outer periphery of the roller closest to the crank sprocket may not be 170 ° or more. It was.
  • the noise during running of the chain affects not only the bending angle of the chain with respect to the roller closest to the chain sprocket of the chain guide but also the bending angle of the chain with respect to all rollers. It has been found that it is proportional to the maximum bending angle among the bending angles of all the rollers.
  • the bending angle of the chain with respect to the roller is the common of the two rollers 12 adjacent on the crank sprocket 2 side between the three rollers 12 arranged in the running direction of the chain 5, as shown in FIG.
  • the bending angle of the chain with respect to the roller closest to the crank sprocket 2 is the common tangent of the roller 12 closest to the crank sprocket 2 and the adjacent roller to the common tangent of the crank sprocket 2 and the roller 12 closest thereto.
  • the bending angle of the chain with respect to the roller closest to the cam sprocket 4 is the common tangent of the cam sprocket 4 and the roller 12 closest thereto with respect to the common tangent of the roller closest to the cam sprocket 4 and the roller adjacent thereto. The angle to make.
  • An object of the present invention is to reduce noise generated by running of a chain in a chain transmission device that rolls and guides the chain with a plurality of guide rollers provided in the chain guide.
  • the present invention provides a chain spanned between a crank sprocket provided on a crankshaft and a cam sprocket provided on a camshaft, and an outer side of a slack side chain of the chain.
  • a chain guide provided so as to be able to swing around one end, and applying an adjustment force of the chain tensioner to the swing side end of the chain guide to urge the chain guide toward the chain.
  • the chain transmission device that rolls and guides the chain by each of a plurality of rotatable rollers provided in the chain guide, a configuration is adopted in which the bending angles of the chain with respect to the plurality of rollers are equal to each other. can do.
  • the present invention provides a chain spanned between a crank sprocket provided on the crankshaft and a cam sprocket provided on the camshaft, and an outer side of the slack side chain of the chain.
  • a chain guide provided so as to be capable of swinging around one end, and applying an adjustment force of the chain tensioner to the swing side end of the chain guide to urge the chain guide toward the chain,
  • the number of the rollers provided on the chain guide is n, and the crank sprocket travels from the chain guide to the chain guide.
  • Each of the bending angles ⁇ i is defined based on a value obtained by dividing the total bending angle ⁇ a by the number n of rollers, and the variation thereof becomes small. For this reason, it is possible to suppress noise during chain running that increases in proportion to the maximum bending angle.
  • each of the bending angles ⁇ i is defined based on the total bending angle ⁇ a and the number n of rollers. For this reason, the noise at the time of chain travel can be suppressed irrespective of the size of the winding angle of the chain on the outer periphery of the roller closest to the crank sprocket.
  • This invention can suppress the noise during chain running by eliminating or reducing the variation in the bending angle of the chain with respect to all the rollers.
  • the chain transmission for driving the camshaft includes a crank sprocket 2 provided at the shaft end portion of the crankshaft 1 and a cam sprocket provided at each of the shaft end portions of the two camshafts 3.
  • a chain guide 6 provided on the outer side of the slack side chain 5a of the timing chain 5 so as to be able to swing around one end portion, and a crankshaft
  • the rotation of 1 is transmitted to the cam shaft 3 to rotate the cam shaft 3.
  • the crankshaft 1 rotates in the direction indicated by the arrow in FIG. 1, and the timing chain 5 (hereinafter simply referred to as the chain) travels in the direction indicated by the arrow in FIG.
  • the portion of the chain 5 that travels upward is the slack side chain 5a, and the portion that travels downward is the tension side chain 5b.
  • the slack side chain 5a has a chain guide 6 for tension adjustment provided on the outside thereof, and the tension side chain 5b has a chain guide 7 for travel guidance provided on the outside thereof.
  • the chain guide 6 for tension adjustment includes a guide base 10 extending long in the traveling direction of the chain 5, a plurality of roller shafts 11 provided at intervals in the length direction of the guide base 10, and a plurality of roller shafts 11. It comprises a plurality of chain guide rollers 12 that are rotatably supported by each.
  • the guide base 10 has a curved shape, and a pair of guide protrusions 13 extending in the length direction of the guide base 10 are provided on both sides in the width direction of the convex surface facing the chain 5, and between the pair of guide protrusions 13. , A plurality of roller receiving recesses 14 are provided at intervals in the length direction of the guide base 10.
  • the guide base 10 has an insertion hole 16 formed at the upper end portion through which the fulcrum shaft 15 is inserted, and is excellent in oil resistance, weather resistance and strength of polyamide 46 (PA46) and polyamide 66 (PA66). It consists of a molded product of synthetic resin.
  • the shaft end portion of the roller shaft 11 is fixed between the inner wall surface portions 17 and 17 opposed in the width direction.
  • the roller shaft 11 is made of SUJ2 or SC material, and is heat-treated to increase the hardness in order to improve wear resistance.
  • bright quenching is employed as the heat treatment, but induction quenching or carburizing quenching may be performed. Alternatively, carbonitriding may be performed.
  • the roller 12 is made of a roller bearing, and has a shell-shaped outer ring 18 formed by drawing a metal plate such as SPC or SCM, and a retainer 20 that holds a plurality of rollers 19 and 19 incorporated therein.
  • the chain guide 6 is supported by a fulcrum shaft 15 projecting from an engine block (not shown) in a state along the traveling direction of the slack side chain 5a, and swings around the fulcrum shaft 15. It is possible to move.
  • the chain guide 6 is urged toward the slack side chain 5a by the adjustment force of the chain tensioner 21 being applied to the lower swing side end.
  • the chain guide 6 rolls and guides the slack side chain 5a by each of the plurality of rollers 12 that come into contact with the slack side chain 5a.
  • the travel guide chain guide 7 is the same as the chain guide 6 for tension adjustment except that the shape of the guide base is different from the guide base 10 in the chain guide 6 for tension adjustment. It is configured. For this reason, the same components as those of the chain guide 6 for tension adjustment are denoted by the same reference numerals and description thereof is omitted.
  • the chain guide 7 for traveling guide is fixed by tightening bolts 22 screwed into an engine block (not shown) at both upper and lower ends in a state along the traveling direction of the tension side chain 5b. The travel of the chain 5 is guided.
  • the chain 5 guided by each of the plurality of rollers 12 of the chain guide 6 for tension adjustment and the chain guide 7 for travel guidance is linear between adjacent rollers 12 and is in each of the positions in contact with the rollers 12. It bends and collides with the outer periphery of the roller 12 to generate noise.
  • the bending angles ⁇ of the chains 5 with respect to all the rollers 12 shown in FIG. 3 are made equal. For this reason, there is no variation in the respective bending angles ⁇ , and the noise during chain running caused by the maximum bending angle can be reduced.
  • the chain rolling device of this embodiment can be applied to the crankshaft of any engine such as an automobile or a motorcycle.
  • the number of cylinders of the engine may be single cylinder or multi-cylinder. For example, by applying to a crankshaft for a four-cycle multi-cylinder engine, an effect of reducing noise during chain running can be expected. .
  • the bending angle of the chain 5 with respect to all the rollers 12 is the total of the trajectory of the chain 5 traveling from the crank sprocket 2 to the chain guide 6 and the trajectory of the chain 5 traveling from the chain guide 6 to the cam sprocket 4. It differs from the first embodiment described above in that it is defined based on the bending angle.
  • the other structure is considered to be the same as that of the first embodiment, and the same reference numerals are given and description thereof is omitted.
  • the bending angles of the chains 5 with respect to all the rollers 12 are set as follows.
  • the number of rollers 12 provided on the chain guide 6 is n, and the total bend formed by the track of the chain 5 traveling from the crank sprocket 2 to the chain guide 6 and the track of the chain 5 traveling from the chain guide 6 to the cam sprocket 4.
  • the angle is ⁇ a
  • the bending angle ⁇ i of the chain 5 with respect to the i-th roller 12 in the traveling direction of the chain 5 from the crank sprocket 2 side is expressed by ( ⁇ a / n) ⁇ 0.95 ⁇ ⁇ i ⁇ ( ⁇ a / n) ⁇ 1.05 (n: integer) (1) It is prescribed to satisfy.
  • the number of rollers 12 provided in the chain guide 6 shown in FIG. 4 is five. For this reason, for example, as the bending angle ⁇ 1 of the chain 5 with respect to the first roller 12, the following equation (2) ( ⁇ a / 5) ⁇ 0.95 ⁇ ⁇ 1 ⁇ ( ⁇ a / 5) ⁇ 1.05 (2) It is prescribed to satisfy.
  • the bending angles ⁇ 2 to ⁇ 5 of the chain 5 with respect to the second to fifth rollers 12 are defined so as to satisfy the above formula (1), similarly to the bending angle ⁇ 1.
  • the bending angles ⁇ 1 to ⁇ 5 thus defined are defined within a range of ⁇ 5% with respect to a value obtained by dividing the total bending angle ⁇ a by the number n of the rollers 12. Therefore, variations in the bending angles ⁇ 1 to ⁇ 5 can be suppressed, and noise during chain running that increases in proportion to the maximum bending angle can be suppressed.
  • the chain winding angle at the outer periphery of the roller closest to the crank sprocket is changed as in the chain guide of Patent Document 2. In some cases, the angle cannot be set to 170 ° or more.
  • each of the bending angles ⁇ 1 to ⁇ 5 of the chain 5 with respect to all the rollers 12 is defined based on the total bending angle ⁇ a and the number n of the rollers 12. For this reason, the noise at the time of chain travel can be suppressed irrespective of the size of the winding angle of the chain on the outer periphery of the roller closest to the crank sprocket.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)

Abstract

Provided is a chain power transmitting device wherein the adjustment force of a chain tensioner (21) is applied to a chain (5) mounted between a crank sprocket (2) provided to a crankshaft (1) and a cam sprocket (4) provided to a camshaft (3), and is also applied to the rocking-side end of a chain guide (6) provided to the outside of the slack-side chain (5a) of the chain (5) so as to be capable of rocking about one end of the chain guide (6), thereby pressing the chain guide (6) toward the chain (5) to cause each of a plurality of rotatable rollers (12) provided to the chain guide (6) to guide the chain (5) while rolling. The bending angles of the chain (5) relative to the plurality of rollers (12) are equalized to reduce noise.

Description

チェーン伝動装置Chain transmission
　本発明は、主として、自動車エンジンのクランク軸の回転をカム軸に伝達するチェーン伝動装置に関する。 The present invention mainly relates to a chain transmission that transmits rotation of a crankshaft of an automobile engine to a camshaft.
クランク軸に取付けられたクランクスプロケットとカム軸に取付けられたカムスプロケット間にタイミングチェーン（以下、単に「チェーン」という）を掛け渡したカム軸駆動用のチェーン伝動装置においては、チェーンの弛み側チェーンの一側方に、そのチェーンの走行方向に沿って延びる揺動可能なチェーンガイドを設け、そのチェーンガイドの揺動側端部にチェーンテンショナの調整力を負荷してタイミングチェーンを緊張させ、チェーンの緩みやバタツキを防ぐようにしている。 In a chain drive for driving a camshaft where a timing chain (hereinafter simply referred to as “chain”) is passed between a crank sprocket attached to the crankshaft and a cam sprocket attached to the camshaft, the chain on the slack side of the chain A swingable chain guide extending along the running direction of the chain is provided on one side of the chain, and the timing chain is tensioned by applying an adjustment force of the chain tensioner to the swing side end of the chain guide. To prevent loosening and fluttering.
　また、チェーンの張り側チェーンにチェーンガイドを設けて固定の配置とし、その固定のチェーンガイドによりチェーンの走行を案内してバタツキを抑制するようにしている。 Also, a chain guide is provided in the chain on the tension side of the chain so that the chain is fixed, and the chain travel is guided by the fixed chain guide to suppress fluttering.
　ここで、チェーンの張力調整用や走行案内用のチェーンガイドとして、凸形の円弧状案内面によってチェーンを面案内する形式のものが知られている。この形式ではチェーンは、滑り接触により案内されるので、チェーンの走行抵抗が大きく、トルクの伝達ロスが大きいという問題がある。 Here, as a chain guide for adjusting the tension of the chain or traveling guide, there is known a type in which the chain is guided by a convex arcuate guide surface. In this type, since the chain is guided by sliding contact, there is a problem that the running resistance of the chain is large and torque transmission loss is large.
　そのような問題点を解決するため、先行技術においては、下記特許文献１において、チェーンの走行方向に長く延びる合成樹脂製のガイドベースによって曲線状に配置された複数のローラ軸の両端部を支持し、その複数のローラ軸のそれぞれによってころ軸受からなるローラを回転自在に支持し、その複数のローラによってチェーンを走行自在に案内するようにしたチェーンガイドを提案している。 In order to solve such a problem, in the prior art, in Patent Document 1 below, both ends of a plurality of roller shafts arranged in a curved shape are supported by a synthetic resin guide base extending long in the running direction of the chain. A chain guide has been proposed in which a roller comprising a roller bearing is rotatably supported by each of the plurality of roller shafts, and the chain is guided to run freely by the plurality of rollers.
　上記チェーンガイドは、チェーンの案内が複数のローラの転がりによる案内である。ローラの転がりによる案内では、チェーンの走行抵抗が小さく、トルクの伝達ロスが小さいという特徴を有している。 In the above chain guide, the chain is guided by rolling of a plurality of rollers. The guide by the rolling of the roller has the characteristics that the running resistance of the chain is small and the torque transmission loss is small.
　ところで、上記特許文献１に記載のチェーンガイドにおいては、チェーンが、ローラ間において直線状態で走行し、ローラと接触する位置のそれぞれで屈曲してローラの外周に衝突する。この衝突によって、円弧状案内面によってチェーンを滑り案内する従来のチェーンガイドに比較して大きな騒音や振動が発生することから、その騒音や振動の低減が求められている。 By the way, in the chain guide described in Patent Document 1, the chain travels in a straight line between the rollers, bends at each of the positions in contact with the rollers, and collides with the outer periphery of the rollers. Due to this collision, a large noise and vibration are generated as compared with the conventional chain guide that slides and guides the chain by the arcuate guide surface. Therefore, reduction of the noise and vibration is required.
　上記騒音や振動の低減を図るため、先行技術においては、チェーンガイドとしてクランクスプロケットに最も近接するローラの外周でのチェーンの巻き角を１７０°以上としたものを提案している（下記特許文献２参照）。 In order to reduce the noise and vibration described above, the prior art has proposed a chain guide having a chain winding angle of 170 ° or more at the outer periphery of the roller closest to the crank sprocket (Patent Document 2 below). reference).
特許第５６６２１９８号公報Japanese Patent No. 5562198 特開２０１５－１５２１１９号公報JP2015-152119A
　上記特許文献２に記載のチェーンガイドは、チェーン走行時の騒音を低減させることが可能である。しかしながら、使用される自動車のエンジンなどの内燃機関の構造や使用されるローラ数などによっては、クランクスプロケットに最も近いローラの外周でのチェーンの巻き角を１７０°以上にすることができない場合があった。 The chain guide described in Patent Document 2 can reduce noise during running of the chain. However, depending on the structure of the internal combustion engine such as the automobile engine used and the number of rollers used, the winding angle of the chain on the outer periphery of the roller closest to the crank sprocket may not be 170 ° or more. It was.
　さらに、本件発明者においては、音響測定試験により、チェーン走行時の騒音は、チェーンガイドのクランクスプロケットに最も近いローラに対するチェーンの屈曲角度のみならず、全てのローラに対するチェーンの屈曲角度のそれぞれに影響され、全てのローラでの屈曲角度のうち、最大の屈曲角度に比例することを見出した。 Furthermore, in the present inventor, according to an acoustic measurement test, the noise during running of the chain affects not only the bending angle of the chain with respect to the roller closest to the chain sprocket of the chain guide but also the bending angle of the chain with respect to all rollers. It has been found that it is proportional to the maximum bending angle among the bending angles of all the rollers.
　ここで、ローラに対するチェーンの屈曲角度とは、図３に示すように、チェーン５の走行方向に並ぶ３個のローラ１２の相互間において、クランクスプロケット２側で隣接する二個のローラ１２の共通接線に対して、カムスプロケット４側で隣接する二個のローラ１２の共通接線のなす角をいう。 Here, the bending angle of the chain with respect to the roller is the common of the two rollers 12 adjacent on the crank sprocket 2 side between the three rollers 12 arranged in the running direction of the chain 5, as shown in FIG. An angle formed by a common tangent of two rollers 12 adjacent on the cam sprocket 4 side with respect to the tangent.
　クランクスプロケット２に最も近いローラに対するチェーンの屈曲角度とは、クランクスプロケット２とこれに最も近いローラ１２との共通接線に対して、クランクスプロケット２に最も近いローラ１２とこれに隣接するローラの共通接線のなす角度をいう。 The bending angle of the chain with respect to the roller closest to the crank sprocket 2 is the common tangent of the roller 12 closest to the crank sprocket 2 and the adjacent roller to the common tangent of the crank sprocket 2 and the roller 12 closest thereto. The angle formed by
　カムスプロケット４に最も近いローラに対するチェーンの屈曲角度とは、カムスプロケット４に最も近いローラとこれに隣接するローラの共通接線に対して、カムスプロケット４とこれに最も近いローラ１２との共通接線のなす角度をいう。 The bending angle of the chain with respect to the roller closest to the cam sprocket 4 is the common tangent of the cam sprocket 4 and the roller 12 closest thereto with respect to the common tangent of the roller closest to the cam sprocket 4 and the roller adjacent thereto. The angle to make.
　この発明の課題は、チェーンガイドに設けられた複数の複数のガイドローラによってチェーンを転がり案内するチェーン伝動装置において、チェーンの走行によって発生する騒音の低減化を図ることにある。 An object of the present invention is to reduce noise generated by running of a chain in a chain transmission device that rolls and guides the chain with a plurality of guide rollers provided in the chain guide.
　上記の課題を解決するために、この発明は、クランク軸に設けられたクランクスプロケットとカム軸に設けられたカムスプロケットとの間に掛け渡されたチェーンと、そのチェーンの弛み側チェーンの外側に一端部を中心にして揺動可能に設けられたチェーンガイドとを有し、そのチェーンガイドの揺動側端部にチェーンテンショナの調整力を付与して前記チェーンガイドを前記チェーンに向けて付勢し、そのチェーンガイドに設けられた複数の回転可能なローラのそれぞれによって前記チェーンを転がり案内するチェーン伝動装置において、複数の前記ローラに対する前記チェーンの屈曲角度のそれぞれが等しくなるようにした構成を採用することができる。 In order to solve the above-described problems, the present invention provides a chain spanned between a crank sprocket provided on a crankshaft and a cam sprocket provided on a camshaft, and an outer side of a slack side chain of the chain. A chain guide provided so as to be able to swing around one end, and applying an adjustment force of the chain tensioner to the swing side end of the chain guide to urge the chain guide toward the chain In the chain transmission device that rolls and guides the chain by each of a plurality of rotatable rollers provided in the chain guide, a configuration is adopted in which the bending angles of the chain with respect to the plurality of rollers are equal to each other. can do.
　この構成によると、全てのローラに対するチェーンの屈曲角度のそれぞれにおいて、そのばらつきがなくなるため、最大となる屈曲角度に比例して大きくなるチェーン走行時の騒音を抑制することができる。 According to this configuration, since there is no variation in each of the chain bending angles with respect to all the rollers, it is possible to suppress noise during chain running that increases in proportion to the maximum bending angle.
　また、上記の課題を解決するために、この発明は、クランク軸に設けられたクランクスプロケットとカム軸に設けられたカムスプロケット間に掛け渡されたチェーンと、そのチェーンの弛み側チェーンの外側に一端部を中心にして揺動可能に設けられたチェーンガイドとを有し、そのチェーンガイドの揺動側端部にチェーンテンショナの調整力を付与してチェーンガイドをチェーンに向けて付勢し、そのチェーンガイドに設けられた複数の回転可能なローラのそれぞれによってチェーンを転がり案内するチェーン伝動装置において、前記チェーンガイドに設けられた前記ローラの個数をｎ、前記クランクスプロケットから前記チェーンガイドへ走行する前記チェーンの軌道と前記チェーンガイドから前記カムスプロケットへ走行する前記チェーンの軌道とのなす総屈曲角度をθａとしたときに、１からｎまでの全ての整数ｉについて、前記クランクスプロケット側から前記チェーンの走行方向へｉ番目の前記ローラに対する前記チェーンの屈曲角度θｉが、次式（１）
　（θａ/ｎ）×０．９５≦θｉ≦（θａ/ｎ）×１．０５（ｎ：整数）　　（１）
を満たす構成を採用することができる。 Further, in order to solve the above-mentioned problems, the present invention provides a chain spanned between a crank sprocket provided on the crankshaft and a cam sprocket provided on the camshaft, and an outer side of the slack side chain of the chain. A chain guide provided so as to be capable of swinging around one end, and applying an adjustment force of the chain tensioner to the swing side end of the chain guide to urge the chain guide toward the chain, In the chain transmission device that rolls and guides the chain by each of a plurality of rotatable rollers provided on the chain guide, the number of the rollers provided on the chain guide is n, and the crank sprocket travels from the chain guide to the chain guide. The chain running from the chain track and the chain guide to the cam sprocket. The angle of bend θi of the chain with respect to the i-th roller in the running direction of the chain from the crank sprocket side for all integers i from 1 to n, where θa is the total bend angle formed with the track of the chain Is the following formula (1)
(Θa / n) × 0.95 ≦ θi ≦ (θa / n) × 1.05 (n: integer) (1)
A configuration satisfying the above can be adopted.
　前記屈曲角度θｉのそれぞれは、総屈曲角度θａをローラの個数ｎで除算した値に基づいて規定され、そのばらつきが小さくなる。このため、最大となる屈曲角度に比例して大きくなるチェーン走行時の騒音を抑制することができる。 Each of the bending angles θi is defined based on a value obtained by dividing the total bending angle θa by the number n of rollers, and the variation thereof becomes small. For this reason, it is possible to suppress noise during chain running that increases in proportion to the maximum bending angle.
　また、屈曲角度θｉのそれぞれは、上記総屈曲角度θａ及びローラの個数ｎに基づいて規定される。このため、クランクスプロケットに最も近いローラの外周でのチェーンの巻き角の大きさによらずに、チェーン走行時の騒音を抑制することができる。 Further, each of the bending angles θi is defined based on the total bending angle θa and the number n of rollers. For this reason, the noise at the time of chain travel can be suppressed irrespective of the size of the winding angle of the chain on the outer periphery of the roller closest to the crank sprocket.
　この発明は、全てのローラに対するチェーンの屈曲角度のそれぞれのばらつきをなくす、または小さくすることで、チェーン走行時の騒音を抑制することができる。 This invention can suppress the noise during chain running by eliminating or reducing the variation in the bending angle of the chain with respect to all the rollers.
この発明に係る第一実施形態のチェーン伝動装置を示す概略図Schematic which shows the chain transmission of 1st embodiment which concerns on this invention 図１のＡ－Ａ線に沿った断面図Sectional view along the line AA in FIG. 同上のローラに対するチェーンの屈曲角度を示す説明図Explanatory drawing which shows the bending angle of a chain with respect to a roller same as the above この発明に係る第二実施形態のチェーン伝動装置の総屈曲角度を示す説明図Explanatory drawing which shows the total bending angle of the chain transmission of 2nd embodiment which concerns on this invention 同上の各ローラに対するチェーンの屈曲角度を示す説明図Explanatory drawing which shows the bending angle of the chain with respect to each roller same as above
　以下、この発明の実施形態を図１乃至図３に基づいて説明する。図１に示すように、カム軸駆動用のチェーン伝動装置は、クランク軸１の軸端部に設けられたクランクスプロケット２と二本のカム軸３の軸端部のそれぞれに設けられたカムスプロケット４、４との間に掛け渡されたタイミングチェーン５と、タイミングチェーン５の弛み側チェーン５ａの外側に一端部を中心にして揺動可能に設けられたチェーンガイド６とを有し、クランク軸１の回転をカム軸３に伝達して、カム軸３を回転させるようにしている。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, the chain transmission for driving the camshaft includes a crank sprocket 2 provided at the shaft end portion of the crankshaft 1 and a cam sprocket provided at each of the shaft end portions of the two camshafts 3. A timing chain 5 spanned between 4 and 4, a chain guide 6 provided on the outer side of the slack side chain 5a of the timing chain 5 so as to be able to swing around one end portion, and a crankshaft The rotation of 1 is transmitted to the cam shaft 3 to rotate the cam shaft 3.
　クランク軸１は、図１の矢印で示す方向に回転し、クランク軸１の回転により、タイミングチェーン５（以下、単にチェーンという）が同図の矢印で示す方向に走行する。チェーン５は、上方に向けて走行する部分が弛み側チェーン５ａとされ、下方に向けて走行する部分が張り側チェーン５ｂとされる。チェーン５としては、ローラチェーンやサイレントチェーンが用いられる。 The crankshaft 1 rotates in the direction indicated by the arrow in FIG. 1, and the timing chain 5 (hereinafter simply referred to as the chain) travels in the direction indicated by the arrow in FIG. The portion of the chain 5 that travels upward is the slack side chain 5a, and the portion that travels downward is the tension side chain 5b. As the chain 5, a roller chain or a silent chain is used.
　弛み側チェーン５ａは、その外側に設けられた張力調整用のチェーンガイド６を有し、張り側チェーン５ｂは、その外側に設けられた走行案内用のチェーンガイド７を有する。 The slack side chain 5a has a chain guide 6 for tension adjustment provided on the outside thereof, and the tension side chain 5b has a chain guide 7 for travel guidance provided on the outside thereof.
　張力調整用のチェーンガイド６は、チェーン５の走行方向に長く延びるガイドベース１０と、ガイドベース１０の長さ方向に間隔をおいて設けられた複数のローラ軸１１と、複数のローラ軸１１のそれぞれに回転自在に支持されたチェーン案内用の複数のローラ１２とからなる。 The chain guide 6 for tension adjustment includes a guide base 10 extending long in the traveling direction of the chain 5, a plurality of roller shafts 11 provided at intervals in the length direction of the guide base 10, and a plurality of roller shafts 11. It comprises a plurality of chain guide rollers 12 that are rotatably supported by each.
　ガイドベース１０は、曲線状をなし、チェーン５と対向する凸形面の幅方向両側にはガイドベース１０の長さ方向に延びる一対のガイド突条１３が設けられ、一対のガイド突条１３間においてガイドベース１０の長さ方向に複数のローラ収容凹部１４が間隔をおいて設けられている。 The guide base 10 has a curved shape, and a pair of guide protrusions 13 extending in the length direction of the guide base 10 are provided on both sides in the width direction of the convex surface facing the chain 5, and between the pair of guide protrusions 13. , A plurality of roller receiving recesses 14 are provided at intervals in the length direction of the guide base 10.
　また、ガイドベース１０は、上端部に形成され、支点軸１５が挿通される挿通孔１６を有し、ポリアミド４６（ＰＡ４６）やポリアミド６６（ＰＡ６６）等の耐油性、耐候性および強度的に優れた合成樹脂の成形品からなる。 The guide base 10 has an insertion hole 16 formed at the upper end portion through which the fulcrum shaft 15 is inserted, and is excellent in oil resistance, weather resistance and strength of polyamide 46 (PA46) and polyamide 66 (PA66). It consists of a molded product of synthetic resin.
　図２に示すように、複数のローラ収容凹部１４のそれぞれは、幅方向に対向する内壁面部１７、１７の間にローラ軸１１の軸端部が固定されている。 As shown in FIG. 2, in each of the plurality of roller accommodating recesses 14, the shaft end portion of the roller shaft 11 is fixed between the inner wall surface portions 17 and 17 opposed in the width direction.
　ローラ軸１１は、ＳＵＪ２やＳＣ材を素材とし、耐摩耗性を向上させるため、熱処理されて硬度が高められている。熱処理として、ここでは、光輝焼入れを採用しているが、高周波焼入れしてもよく、浸炭焼入れしてもよい。あるいは、浸炭窒化処理してもよい。 The roller shaft 11 is made of SUJ2 or SC material, and is heat-treated to increase the hardness in order to improve wear resistance. Here, bright quenching is employed as the heat treatment, but induction quenching or carburizing quenching may be performed. Alternatively, carbonitriding may be performed.
　ローラ１２は、ころ軸受からなり、ＳＰＣやＳＣＭ等の金属板を絞り成形したシェル形の外輪１８と、その内側に組み込まれた複数のころ１９ところ１９を保持する保持器２０とを有する。 The roller 12 is made of a roller bearing, and has a shell-shaped outer ring 18 formed by drawing a metal plate such as SPC or SCM, and a retainer 20 that holds a plurality of rollers 19 and 19 incorporated therein.
　チェーンガイド６は、弛み側チェーン５ａの走行方向に沿う状態において、ガイドベース１０の上端部がエンジンブロック（図示省略）から突設する支点軸１５により支持されて、その支点軸１５を中心に揺動可能とされる。 The chain guide 6 is supported by a fulcrum shaft 15 projecting from an engine block (not shown) in a state along the traveling direction of the slack side chain 5a, and swings around the fulcrum shaft 15. It is possible to move.
　また、チェーンガイド６は、下側の揺動側端部に対してチェーンテンショナ２１の調整力が負荷されて弛み側チェーン５ａに向けて付勢されている。弛み側チェーン５ａと接触する複数のローラ１２のそれぞれによってチェーンガイド６が弛み側チェーン５ａを転がり案内するようになっている。 Also, the chain guide 6 is urged toward the slack side chain 5a by the adjustment force of the chain tensioner 21 being applied to the lower swing side end. The chain guide 6 rolls and guides the slack side chain 5a by each of the plurality of rollers 12 that come into contact with the slack side chain 5a.
　走行案内用のチェーンガイド７は、図１に示すように、ガイドベースの形状が張力調整用のチェーンガイド６におけるガイドベース１０と相違するのみであって、張力調整用のチェーンガイド６と同様の構成とされている。このため、張力調整用のチェーンガイド６と同一の部品には同一の符号を付して説明を省略する。 As shown in FIG. 1, the travel guide chain guide 7 is the same as the chain guide 6 for tension adjustment except that the shape of the guide base is different from the guide base 10 in the chain guide 6 for tension adjustment. It is configured. For this reason, the same components as those of the chain guide 6 for tension adjustment are denoted by the same reference numerals and description thereof is omitted.
　走行案内用のチェーンガイド７は、張り側チェーン５ｂの走行方向に沿う状態において、その上下両端部がエンジンブロック（図示省略）にねじ込まれるボルト２２の締め付けにより固定されて、複数のローラのそれぞれでチェーン５の走行を案内するようになっている。 The chain guide 7 for traveling guide is fixed by tightening bolts 22 screwed into an engine block (not shown) at both upper and lower ends in a state along the traveling direction of the tension side chain 5b. The travel of the chain 5 is guided.
　張力調整用のチェーンガイド６および走行案内用のチェーンガイド７の複数のローラ１２のそれぞれで案内されるチェーン５は、隣接するローラ１２間において直線状をなし、ローラ１２と接触する位置のそれぞれで屈曲してローラ１２の外周に衝突し、騒音が発生する。 The chain 5 guided by each of the plurality of rollers 12 of the chain guide 6 for tension adjustment and the chain guide 7 for travel guidance is linear between adjacent rollers 12 and is in each of the positions in contact with the rollers 12. It bends and collides with the outer periphery of the roller 12 to generate noise.
　その騒音の低減を図るため、ここでは、図３に示される全てのローラ１２に対するチェーン５の屈曲角度θのそれぞれが等しくなるようにしている。このため、それぞれの屈曲角度θにばらつきがなくなり、屈曲角度が最大となることにより生ずるチェーン走行時の騒音の低減が図られる。 In order to reduce the noise, here, the bending angles θ of the chains 5 with respect to all the rollers 12 shown in FIG. 3 are made equal. For this reason, there is no variation in the respective bending angles θ, and the noise during chain running caused by the maximum bending angle can be reduced.
　また、この実施形態のチェーン転動装置は、自動車や二輪車等のあらゆるエンジンのクランク軸に対して適用可能である。エンジンの気筒数は単気筒であっても多気筒であってもよく、例えば、四サイクル多気筒エンジン用のクランク軸に対して適用することによっても、チェーン走行時の騒音の低減効果が期待できる。 Further, the chain rolling device of this embodiment can be applied to the crankshaft of any engine such as an automobile or a motorcycle. The number of cylinders of the engine may be single cylinder or multi-cylinder. For example, by applying to a crankshaft for a four-cycle multi-cylinder engine, an effect of reducing noise during chain running can be expected. .
　この発明の第二実施形態に係るチェーン伝達装置を図４、５に基づいて説明する。この実施形態は、全てのローラ１２に対するチェーン５の屈曲角度を、クランクスプロケット２からチェーンガイド６へ走行するチェーン５の軌道とチェーンガイド６からカムスプロケット４へ走行するチェーン５の軌道とのなす総屈曲角度に基づいて規定した点で、上述した第一実施形態と相違する。その他の構造は、第一実施形態と同じと考えられ、同じ符号を付してその説明を省略する。 A chain transmission device according to a second embodiment of the present invention will be described with reference to FIGS. In this embodiment, the bending angle of the chain 5 with respect to all the rollers 12 is the total of the trajectory of the chain 5 traveling from the crank sprocket 2 to the chain guide 6 and the trajectory of the chain 5 traveling from the chain guide 6 to the cam sprocket 4. It differs from the first embodiment described above in that it is defined based on the bending angle. The other structure is considered to be the same as that of the first embodiment, and the same reference numerals are given and description thereof is omitted.
　この実施形態のチェーン伝達装置において、全てのローラ１２に対するチェーン５の屈曲角度は、以下のように設定される。 In the chain transmission device of this embodiment, the bending angles of the chains 5 with respect to all the rollers 12 are set as follows.
　すなわち、チェーンガイド６に設けられたローラ１２の個数をｎ、クランクスプロケット２からチェーンガイド６へ走行するチェーン５の軌道とチェーンガイド６からカムスプロケット４へ走行するチェーン５の軌道とのなす総屈曲角度をθａとしたときに、１からｎまでの全ての整数ｉについて、クランクスプロケット２側からチェーン５の走行方向へｉ番目のローラ１２に対するチェーン５の屈曲角度θｉが次式（１）
　（θａ/ｎ）×０．９５≦θｉ≦（θａ/ｎ）×１．０５（ｎ：整数）　　（１）
を満たすように規定される。 That is, the number of rollers 12 provided on the chain guide 6 is n, and the total bend formed by the track of the chain 5 traveling from the crank sprocket 2 to the chain guide 6 and the track of the chain 5 traveling from the chain guide 6 to the cam sprocket 4. When the angle is θa, the bending angle θi of the chain 5 with respect to the i-th roller 12 in the traveling direction of the chain 5 from the crank sprocket 2 side is expressed by
(Θa / n) × 0.95 ≦ θi ≦ (θa / n) × 1.05 (n: integer) (1)
It is prescribed to satisfy.
　上記式（１）において、屈曲角度θｉが（θａ/ｎ）×０．９５よりも小さい値となると、チェーンガイド６による弛み側チェーン５ａへの付勢力が不足し、チェーン５の円滑な走行が難しくなる。 In the above formula (1), when the bending angle θi becomes a value smaller than (θa / n) × 0.95, the urging force of the chain guide 6 to the slack side chain 5a is insufficient, and the chain 5 runs smoothly. It becomes difficult.
　その一方で、屈曲角度θｉが（θａ/ｎ）×１．０５よりも大きい値となると、チェーン走行時の騒音の抑制効果に影響するおそれがある。 On the other hand, if the bending angle θi is larger than (θa / n) × 1.05, it may affect the noise suppressing effect during chain running.
　図４に示されたチェーンガイド６に設けられたローラ１２の個数は５個である。このため、例えば、第１番目のローラ１２に対するチェーン５の屈曲角度θ１としては、次式（２）
　（θａ/５）×０．９５≦θ１≦（θａ/５）×１．０５　　　（２）
を満たすように規定される。 The number of rollers 12 provided in the chain guide 6 shown in FIG. 4 is five. For this reason, for example, as the bending angle θ1 of the chain 5 with respect to the first roller 12, the following equation (2)
(Θa / 5) × 0.95 ≦ θ1 ≦ (θa / 5) × 1.05 (2)
It is prescribed to satisfy.
　また、第２～５番目のローラ１２に対するチェーン５の屈曲角度θ２～θ５は、屈曲角度θ１と同様に、上記式（１）を満たすように規定される。 Also, the bending angles θ2 to θ5 of the chain 5 with respect to the second to fifth rollers 12 are defined so as to satisfy the above formula (1), similarly to the bending angle θ1.
　このように規定された屈曲角度θ１～θ５は、上記総屈曲角度θａをローラ１２の個数ｎで除算した値に対して±５％の範囲内に規定される。このため、屈曲角度θ１～θ５は、そのばらつきが抑えられ、最大となる屈曲角度に比例して大きくなるチェーン走行時の騒音を抑制することができる。 The bending angles θ1 to θ5 thus defined are defined within a range of ± 5% with respect to a value obtained by dividing the total bending angle θa by the number n of the rollers 12. Therefore, variations in the bending angles θ1 to θ5 can be suppressed, and noise during chain running that increases in proportion to the maximum bending angle can be suppressed.
　ここで、使用される自動車のエンジンなどの内燃機関の構造や使用されるローラ数などによっては、特許文献２のチェーンガイドのように、クランクスプロケットに最も近いローラの外周でのチェーンの巻き角を１７０°以上にすることができない場合がある。 Here, depending on the structure of an internal combustion engine such as an automobile engine used and the number of rollers used, the chain winding angle at the outer periphery of the roller closest to the crank sprocket is changed as in the chain guide of Patent Document 2. In some cases, the angle cannot be set to 170 ° or more.
　この場合であっても、全てのローラ１２に対するチェーン５の屈曲角度θ１～θ５のそれぞれは、上記総屈曲角度θａ及びローラ１２の個数ｎに基づいて規定される。このため、クランクスプロケットに最も近いローラの外周でのチェーンの巻き角の大きさによらず、チェーン走行時の騒音を抑制することができる。 Even in this case, each of the bending angles θ1 to θ5 of the chain 5 with respect to all the rollers 12 is defined based on the total bending angle θa and the number n of the rollers 12. For this reason, the noise at the time of chain travel can be suppressed irrespective of the size of the winding angle of the chain on the outer periphery of the roller closest to the crank sprocket.
１　クランク軸
２　クランクスプロケット
３　カム軸
４　カムスプロケット
５　タイミングチェーン（チェーン）
５ａ　弛み側チェーン
５ｂ　張り側チェーン
６、７　チェーンガイド
１０　ガイドベース
１１　ローラ軸
１２　ローラ
１３　ガイド突条
１４　ローラ収容凹部
１５　支点軸
１６　挿通孔
１７　内壁面部
１８　外輪
１９　ころ
２０　保持器
２１　チェーンテンショナ
２２　ボルト 1 Crankshaft 2 Crank Sprocket 3 Camshaft 4 Cam Sprocket 5 Timing Chain (Chain)
5a Slack side chain 5b Tight side chain 6, 7 Chain guide 10 Guide base 11 Roller shaft 12 Roller 13 Guide protrusion 14 Roller receiving recess 15 Support shaft 16 Insertion hole 17 Inner wall surface portion 18 Outer ring 19 Roller 20 Cage 21 Chain tensioner 22 Bolt

Claims (2)

  1. 　クランク軸に設けられたクランクスプロケットとカム軸に設けられたカムスプロケットとの間に掛け渡されたチェーンと、そのチェーンの弛み側チェーンの外側に一端部を中心にして揺動可能に設けられたチェーンガイドとを有し、そのチェーンガイドの揺動側端部にチェーンテンショナの調整力を付与して前記チェーンガイドを前記チェーンに向けて付勢し、そのチェーンガイドに設けられた複数の回転可能なローラのそれぞれによって前記チェーンを転がり案内するチェーン伝動装置において、
    　複数の前記ローラに対する前記チェーンの屈曲角度のそれぞれが等しくなるようにしたことを特徴とするチェーン転動装置。     A chain spanned between a crank sprocket provided on the crankshaft and a cam sprocket provided on the camshaft, and provided on the outside of the slack side chain of the chain so as to be swingable around one end. A chain guide is provided, and an adjustment force of a chain tensioner is applied to the swing side end portion of the chain guide to urge the chain guide toward the chain, and a plurality of rotations provided on the chain guide are possible. In the chain transmission device that rolls and guides the chain with each of the rollers,
    A chain rolling device characterized in that each of the bending angles of the chain with respect to the plurality of rollers is equal.
  2. 　クランク軸に設けられたクランクスプロケットとカム軸に設けられたカムスプロケット間に掛け渡されたチェーンと、そのチェーンの弛み側チェーンの外側に一端部を中心にして揺動可能に設けられたチェーンガイドとを有し、そのチェーンガイドの揺動側端部にチェーンテンショナの調整力を付与してチェーンガイドをチェーンに向けて付勢し、そのチェーンガイドに設けられた複数の回転可能なローラのそれぞれによってチェーンを転がり案内するチェーン伝動装置において、
    　前記チェーンガイドに設けられた前記ローラの個数をｎ、前記クランクスプロケットから前記チェーンガイドへ走行する前記チェーンの軌道と前記チェーンガイドから前記カムスプロケットへ走行する前記チェーンの軌道とのなす総屈曲角度をθａとしたときに、１からｎまでの全ての整数ｉについて、前記クランクスプロケット側から前記チェーンの走行方向へｉ番目の前記ローラに対する前記チェーンの屈曲角度θｉが、次式
    　（θａ/ｎ）×０．９５≦θｉ≦（θａ/ｎ）×１．０５（ｎ：整数）
    を満たすことを特徴とするチェーン伝動装置。     A chain spanned between the crank sprocket provided on the crankshaft and the cam sprocket provided on the camshaft, and a chain guide provided on the outer side of the chain on the slack side of the chain so as to be swingable around one end. Each of the plurality of rotatable rollers provided on the chain guide is configured to apply an adjustment force of the chain tensioner to the swing side end of the chain guide and urge the chain guide toward the chain. In the chain transmission device that guides the chain by rolling,
    The number of the rollers provided in the chain guide is n, and the total bending angle formed by the chain trajectory that travels from the crank sprocket to the chain guide and the chain trajectory that travels from the chain guide to the cam sprocket. Assuming that θa, for all integers 1 to n, the bending angle θi of the chain with respect to the i-th roller from the crank sprocket side in the running direction of the chain is expressed by the following equation (θa / n) × 0.95 ≦ θi ≦ (θa / n) × 1.05 (n: integer)
    A chain transmission characterized by satisfying
PCT/JP2017/010938 2016-03-23 2017-03-17 Chain power transmitting device WO2017164123A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-058476 2016-03-23
JP2016058476A JP6190484B1 (en) 2016-03-23 2016-03-23 Chain transmission

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001187948A (en) * 1999-12-28 2001-07-10 Unitta Co Ltd Drive transmitting device
JP2013072500A (en) * 2011-09-28 2013-04-22 Ntn Corp Chain guide and chain transmission device
JP2015152119A (en) * 2014-02-17 2015-08-24 Ntn株式会社 Cam shaft drive chain transmission device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001187948A (en) * 1999-12-28 2001-07-10 Unitta Co Ltd Drive transmitting device
JP2013072500A (en) * 2011-09-28 2013-04-22 Ntn Corp Chain guide and chain transmission device
JP2015152119A (en) * 2014-02-17 2015-08-24 Ntn株式会社 Cam shaft drive chain transmission device

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