WO2014192339A1 - Chain driving sprocket - Google Patents

Chain driving sprocket Download PDF

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Publication number
WO2014192339A1
WO2014192339A1 PCT/JP2014/054434 JP2014054434W WO2014192339A1 WO 2014192339 A1 WO2014192339 A1 WO 2014192339A1 JP 2014054434 W JP2014054434 W JP 2014054434W WO 2014192339 A1 WO2014192339 A1 WO 2014192339A1
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Prior art keywords
rotating member
chain
sprocket
tooth
elastic members
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PCT/JP2014/054434
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French (fr)
Japanese (ja)
Inventor
裕樹 石田
健太郎 山根
誠二 越智
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株式会社椿本チエイン
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Priority to KR1020157033372A priority Critical patent/KR101821875B1/en
Priority to CN201480030025.4A priority patent/CN105247247B/en
Publication of WO2014192339A1 publication Critical patent/WO2014192339A1/en

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    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/30—Chain-wheels
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/1201—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon for damping of axial or radial, i.e. non-torsional vibrations
    • 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
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/12—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon
    • F16F15/121—Suppression of vibrations in rotating systems by making use of members moving with the system using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon using springs as elastic members, e.g. metallic springs
    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/12—Toothed members; Worms with body or rim assembled out of detachable parts
    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/14—Construction providing resilience or vibration-damping

Abstract

This chain driving sprocket (11) comprises a rotation member (21) having a rotation axis, and multiple tooth bodies (24) arranged along the outer circumference of the rotation member (21) and supported by the rotation member (21). Each of the tooth bodies (24) has one or multiple teeth (24a) capable of engaging with a part of the chain. Between the rotation member (21) and the multiple tooth bodies (24), multiple elastic members (41, 42) are arranged configured so as to absorb impact applied to the tooth bodies (24) from the chain. The elastic members (41, 42) are of at least two types which have different shapes, form an angle relative to each other, and are arranged in different positions on the rotation member (21).

Description

チェーン駆動用のスプロケットSprocket for chain drive
　本発明は、チェーンと噛合する複数の歯部を外周に備えるチェーン駆動用のスプロケットに関する。このスプロケットは、チェーンと歯部とが噛合した状態で回転することによりチェーンを駆動する。 The present invention relates to a sprocket for driving a chain that includes a plurality of teeth on the outer periphery that mesh with the chain. The sprocket drives the chain by rotating in a state where the chain and the tooth portion are engaged with each other.
　従来、この種のチェーン駆動用のスプロケットとして、駆動シャフトが嵌入される軸孔を有する内周部材と、チェーンのローラと噛合可能な複数の歯部が外周に沿って等間隔で配置されている外周部材と、内周部材と外周部材との間に、周方向に沿って等間隔で配置される複数の円筒状ダンパ部材（弾性部材）とを備えたものが知られている（例えば、特許文献１）。 Conventionally, as this type of chain drive sprocket, an inner peripheral member having a shaft hole into which a drive shaft is inserted, and a plurality of teeth that can mesh with a roller of the chain are arranged at equal intervals along the outer periphery. A device including an outer peripheral member and a plurality of cylindrical damper members (elastic members) arranged at equal intervals along the circumferential direction between the outer peripheral member and the outer peripheral member is known (for example, a patent) Reference 1).
　この従来のスプロケットは、内周部材の外周面に、周方向に沿って等間隔を置いて設けられた複数の半円状の凹溝と、外周部材の内周面に、周方向に沿って等間隔を置いて設けられた複数の半円状の凹溝とを有する。内周部材の各凹溝と外周部材の各凹溝とはラジアル方向において互いに対向し、対向する凹溝の間に円筒状ダンパ部材が挟持されている。チェーン駆動時にチェーンが外周部材の歯部と衝突することにより生じる衝撃が円筒状ダンパ部材により吸収されるため、騒音が低減される。 This conventional sprocket has a plurality of semicircular concave grooves provided at equal intervals in the circumferential direction on the outer circumferential surface of the inner circumferential member, and an inner circumferential surface of the outer circumferential member along the circumferential direction. And a plurality of semicircular concave grooves provided at equal intervals. Each concave groove of the inner peripheral member and each concave groove of the outer peripheral member face each other in the radial direction, and a cylindrical damper member is sandwiched between the opposing concave grooves. Since the impact generated when the chain collides with the teeth of the outer peripheral member when the chain is driven is absorbed by the cylindrical damper member, noise is reduced.
特開２００７－２７０８７８号公報JP 2007-270878 A
　上記した従来のスプロケットでは、弾性部材としての円筒状ダンパ部材が、スプロケットの周方向に沿って複数の位置に配置されている。しかしながら、これらの円筒状ダンパ部材は全て同一形状及び同一の配向方向を有する。そのため、チェーンの駆動時にチェーンから外周部材に加わる衝撃力の作用方向が多岐に亘る場合、同一形状かつ同一の配向方向の円筒状ダンパ部材は、所定方向以外の方向からの衝撃を効果的に吸収できず、騒音を低減できない虞があった。 In the conventional sprocket described above, cylindrical damper members as elastic members are arranged at a plurality of positions along the circumferential direction of the sprocket. However, these cylindrical damper members all have the same shape and the same orientation direction. Therefore, when the action direction of impact force applied from the chain to the outer peripheral member when driving the chain is diverse, the cylindrical damper member having the same shape and the same orientation direction effectively absorbs the impact from directions other than the predetermined direction. There was a possibility that noise could not be reduced.
　本発明の目的は、チェーンの駆動時にチェーンから加わる多様な衝撃に対して、それらの衝撃を効果的に吸収することにより騒音を低減することができるチェーン駆動用のスプロケットを提供することにある。 An object of the present invention is to provide a chain drive sprocket capable of reducing noise by effectively absorbing various impacts applied from the chain when the chain is driven.
　本発明の一態様によれば、チェーン駆動用のスプロケットが提供され、このチェーン駆動用のスプロケットは、回転軸線を有する回転部材と、前記回転部材の外周に沿って配置されると共に前記回転部材に支持される複数の歯体であって、前記複数の歯体の各々がチェーンの一部と噛合可能な１つ又は複数の歯部を有する前記複数の歯体と、前記回転部材と前記複数の歯体との間に配置されると共に、前記チェーンから前記複数の歯体に加わる衝撃を吸収するように構成された複数の弾性部材とを備え、前記複数の弾性部材は、互いに異なる形状を有し、かつ互いに角度をなして前記回転部材上の異なる位置に配置される少なくとも２種類の弾性部材からなる。 According to one aspect of the present invention, a chain driving sprocket is provided, and the chain driving sprocket is disposed along a rotation member having a rotation axis and an outer periphery of the rotation member. A plurality of tooth bodies to be supported, each of the plurality of tooth bodies having one or a plurality of tooth portions that can mesh with a part of a chain; the rotating member; And a plurality of elastic members arranged to absorb impacts applied to the plurality of tooth bodies from the chain, and the plurality of elastic members have different shapes from each other. And at least two types of elastic members arranged at different positions on the rotating member at an angle to each other.
　この構成によれば、回転部材と複数の歯体との間には、互いに異なる形状を有する少なくとも２種類の弾性部材が、互いに角度をなして回転部材上の異なる位置に配置されている。そのため、チェーンの駆動時にチェーンから複数の歯体に加わる衝撃力の作用方向が多岐に亘る場合であっても、各方向からの衝撃に対して何れかの弾性部材がその衝撃を効果的に吸収する。したがって、チェーンの駆動時にチェーンから各歯体に対し多様な衝撃が加わる場合にも、それらの衝撃を吸収し、騒音を低減することができる。 According to this configuration, at least two types of elastic members having different shapes are arranged at different positions on the rotating member between the rotating member and the plurality of tooth bodies at an angle. Therefore, even when the direction of the impact force applied from the chain to a plurality of teeth when driving the chain is diverse, any elastic member effectively absorbs the impact against the impact from each direction. To do. Therefore, even when various impacts are applied from the chain to each tooth body when the chain is driven, those impacts can be absorbed and noise can be reduced.
　上記チェーン駆動用のスプロケットにおいて、前記少なくとも２種類の弾性部材は、前記回転部材のラジアル方向における前記回転部材と前記複数の歯体との間に配置される第１の弾性部材と、前記回転部材のアキシャル方向における前記回転部材と前記複数の歯体との間に配置される第２の弾性部材とを含むことが好ましい。 In the chain driving sprocket, the at least two types of elastic members include a first elastic member disposed between the rotating member and the plurality of tooth bodies in a radial direction of the rotating member, and the rotating member. It is preferable that the 2nd elastic member arrange | positioned between the said rotation member and these tooth bodies in the axial direction is included.
　この構成によれば、チェーンが歯部に噛合するとき、歯体に加わる回転部材のラジアル方向の衝撃は第１の弾性部材により吸収される。さらに、チェーンが歯部に噛合するとき、歯体は回転部材のアキシャル方向に振動することがある。しかしながら、そのような振動は第２の弾性部材により減衰される。その結果、騒音を効果的に低減することができる。 According to this configuration, when the chain meshes with the tooth portion, the radial impact of the rotating member applied to the tooth body is absorbed by the first elastic member. Further, when the chain meshes with the tooth portion, the tooth body may vibrate in the axial direction of the rotating member. However, such vibration is attenuated by the second elastic member. As a result, noise can be effectively reduced.
　上記チェーン駆動用のスプロケットにおいて、前記複数の歯体の各々は、少なくとも１つの剛性固定部材により前記回転部材に固定されることが好ましい。 In the chain driving sprocket, each of the plurality of tooth bodies is preferably fixed to the rotating member by at least one rigid fixing member.
　この構成によれば、回転部材が回転するとき、回転部材と複数の歯体との間に配置されている複数の弾性部材にはトルクがかからないため、各弾性部材の疲弊を抑制することができる。 According to this configuration, when the rotating member rotates, torque is not applied to the plurality of elastic members arranged between the rotating member and the plurality of tooth bodies, so that fatigue of each elastic member can be suppressed. .
　上記チェーン駆動用のスプロケットにおいて、前記少なくとも２種類の弾性部材は、それぞれ、前記回転部材の周方向に沿って互いに独立して配置可能な複数の弾性部材からなることが好ましい。 In the sprocket for driving a chain, it is preferable that the at least two types of elastic members each include a plurality of elastic members that can be arranged independently of each other along the circumferential direction of the rotating member.
　この構成によれば、弾性部材を交換するとき、回転部材の周方向全体に亘る円環状の一体型弾性部材を交換する場合とは異なり、周方向に並んで配置された複数の弾性部材のうち、劣化などのために交換される必要がある弾性部材だけを交換すればよい。したがって、弾性部材の交換に関わるコストを低減できる。 According to this configuration, when replacing the elastic member, unlike the case of replacing the annular integrated elastic member over the entire circumferential direction of the rotating member, among the plurality of elastic members arranged in the circumferential direction. Only the elastic member that needs to be replaced due to deterioration or the like needs to be replaced. Therefore, it is possible to reduce the cost related to replacement of the elastic member.
　上記チェーン駆動用のスプロケットにおいて、前記少なくとも２種類の弾性部材は、前記回転部材及び前記複数の歯体よりもヤング率が小さい材料で構成されていることが好ましい。 In the chain driving sprocket, the at least two types of elastic members are preferably made of a material having a Young's modulus smaller than that of the rotating member and the plurality of tooth bodies.
　この構成によれば、複数の弾性部材の材料は、回転部材及び歯体の材料よりもヤング率が小さいことのみを条件として、多種多様な材料の中から、使用環境に応じて適宜選択することができる。 According to this configuration, the material of the plurality of elastic members is appropriately selected from a wide variety of materials according to the use environment, only on the condition that the Young's modulus is smaller than the material of the rotating member and the tooth body. Can do.
　本発明によれば、チェーンの駆動時にチェーンからスプロケットに加わる多様な衝撃を効果的に吸収することができ、その結果、騒音を低減することができる。 According to the present invention, various impacts applied to the sprocket from the chain when the chain is driven can be effectively absorbed, and as a result, noise can be reduced.
第１実施形態のスプロケットによるチェーン駆動状態を示す斜視図。The perspective view which shows the chain drive state by the sprocket of 1st Embodiment. （ａ）は第１実施形態のスプロケットを一方向から見た斜視図、（ｂ）は同じスプロケットを別の方向から見た斜視図。(A) is the perspective view which looked at the sprocket of 1st Embodiment from one direction, (b) is the perspective view which looked at the same sprocket from another direction. 第１実施形態のスプロケットの分解斜視図。The disassembled perspective view of the sprocket of 1st Embodiment. 第１実施形態のスプロケットの歯部にチェーンが噛合した状態を示す一部省略破断面図。FIG. 3 is a partially omitted broken sectional view showing a state where a chain meshes with a tooth portion of the sprocket of the first embodiment. 第２実施形態のスプロケットの斜視図。The perspective view of the sprocket of 2nd Embodiment. 第３実施形態のスプロケットの斜視図。The perspective view of the sprocket of 3rd Embodiment.
　（第１実施形態）
　以下、チェーン駆動用のスプロケットの第１実施形態について図１～４を参照して説明する。 (First embodiment)
A first embodiment of a chain driving sprocket will be described below with reference to FIGS.
　図１に示すように、本実施形態におけるチェーン駆動用のスプロケット１１は、チェーン１２と噛合した状態で駆動力の伝達に基づき回転することによって、チェーン１２を順方向又は逆方向に駆動する。 As shown in FIG. 1, the chain driving sprocket 11 in this embodiment drives the chain 12 in the forward or reverse direction by rotating based on the transmission of the driving force while meshing with the chain 12.
　チェーン１２は、その幅方向において対向する複数対のリンクプレート、例えば複数対の内プレート１３及び複数対の外プレート１４を有する。より具体的には、２枚の内プレート１３は、円筒状ブシュ（図示略）により、互いに離間して対向するように連結され、内プレート１３の対を形成する。内プレート１３の各端部は、内プレート１３の各端部が外プレート１４の内側に配置されるように、外プレート１４の各端部と重なり合う。内プレート１３の対と外プレート１４の対とは、内プレート１３と外プレート１４とが重なり合う部分において、ブシュ内に挿入されるピン１５により回動自在に連結される。このように、チェーン１２は、内プレート１３の対と外プレート１４の対とを交互に直列に連結することにより所定長さに形成される。対向する２枚の内プレート１３の間のピン１５の周囲には、ローラ１６が回転自在に装着される。スプロケット１１の外周に設けられた各歯部にローラ１６が噛合し、スプロケット１１の回転に伴いチェーン１２がスプロケット１１の回転方向へ引っ張られることにより、チェーン１２は順方向又は逆方向に移動する。 The chain 12 has a plurality of pairs of link plates facing each other in the width direction, for example, a plurality of pairs of inner plates 13 and a plurality of pairs of outer plates 14. More specifically, the two inner plates 13 are connected by a cylindrical bush (not shown) so as to be spaced apart from each other to form a pair of inner plates 13. Each end of the inner plate 13 overlaps with each end of the outer plate 14 such that each end of the inner plate 13 is disposed inside the outer plate 14. The pair of the inner plate 13 and the pair of the outer plate 14 are rotatably connected by a pin 15 inserted into the bush at a portion where the inner plate 13 and the outer plate 14 overlap. Thus, the chain 12 is formed in a predetermined length by alternately connecting a pair of inner plates 13 and a pair of outer plates 14 in series. A roller 16 is rotatably mounted around the pin 15 between the two inner plates 13 facing each other. The roller 16 meshes with each tooth portion provided on the outer periphery of the sprocket 11, and the chain 12 is pulled in the rotation direction of the sprocket 11 as the sprocket 11 rotates, whereby the chain 12 moves in the forward direction or the reverse direction.
　図２（ａ）及び図２（ｂ）に示すように、スプロケット１１は、金属材料（例えば、鉄など）からなる略円板状の回転部材２１と、回転部材２１に支持される金属材料（例えば、鉄など）からなる複数の歯体２４とを備える。複数の歯体２４は、剛性金属材料（例えば、鉄など）からなる固定部材、例えばボルト２２及びナット２３を用いて回転部材２１に固定される。回転部材２１は、その中央に、駆動力を伝達するための駆動軸（図示略）が嵌入される軸孔２５を有する。回転部材２１は駆動軸の回転に伴い、軸孔２５の中心軸線Ｐを中心として回転する。 As shown in FIGS. 2A and 2B, the sprocket 11 includes a substantially disc-shaped rotating member 21 made of a metal material (for example, iron) and a metal material (supported by the rotating member 21). For example, a plurality of tooth bodies 24 made of iron or the like are provided. The plurality of tooth bodies 24 are fixed to the rotating member 21 using a fixing member made of a rigid metal material (for example, iron), for example, a bolt 22 and a nut 23. The rotating member 21 has a shaft hole 25 in the center of which a driving shaft (not shown) for transmitting a driving force is fitted. The rotating member 21 rotates around the central axis P of the shaft hole 25 as the drive shaft rotates.
　図３に示すように、回転部材２１は、内周部２６を貫通する軸孔２５を有する内周部２６と、内周部２６からラジアル方向外側に連なる中間部２７と、中間部２７からラジアル方向外側に連なる外周部２８とを有する。アキシャル方向において、中間部２７の厚さは内周部２６よりも薄く、外周部２８の厚さは中間部２７の略半分である。外周部２８は、周方向全体に亘って連続する環状の板である。外周部２８と中間部２７との間の境界は段差２９によって画定される。外周部２８には、厚さ方向に貫通する複数（本実施形態では２０個）の孔３０が、周方向に沿って等間隔を置いて形成されている。孔３０にはボルト２２を挿通可能である。 As shown in FIG. 3, the rotating member 21 includes an inner peripheral portion 26 having a shaft hole 25 that passes through the inner peripheral portion 26, an intermediate portion 27 that extends radially outward from the inner peripheral portion 26, and a radial portion from the intermediate portion 27. And an outer peripheral portion 28 connected to the outer side in the direction. In the axial direction, the thickness of the intermediate portion 27 is thinner than that of the inner peripheral portion 26, and the thickness of the outer peripheral portion 28 is substantially half that of the intermediate portion 27. The outer peripheral part 28 is a cyclic | annular board continuous over the whole circumferential direction. A boundary between the outer peripheral portion 28 and the intermediate portion 27 is defined by a step 29. A plurality (20 in this embodiment) of holes 30 penetrating in the thickness direction are formed in the outer peripheral portion 28 at equal intervals along the circumferential direction. Bolts 22 can be inserted into the holes 30.
　複数の歯体２４は、回転部材２１の周方向に沿って均等に配置され、外周部２８上に固定される。本実施形態では、歯体２４の数は１０個である。各歯体２４は、回転部材２１の中間部２７とアキシャル方向の厚さが略同一の板状片である。また、各歯体２４は回転部材２１の外周部２８の輪郭形状と適合する円弧形状を有する。各歯体２４の外周縁にはチェーン１２のローラ１６と噛合可能な２つの歯部２４ａが形成されている。各歯体２４は内周側部位及び外周側部位を有し、それらの間の境界は段差３１により画定される。内周側部位の厚さは外周側部位の厚さの略半分である。内周側部位には、厚さ方向に貫通する２つの孔３２が、ラジアル方向において歯部２４ａと対応する位置に形成されている。孔３２にはボルト２２を挿通可能である。歯体２４を回転部材２１に取り付ける際は、歯体２４の孔３２が回転部材２１の孔３０と重なるように歯体２４を回転部材２１上に位置決めし、その後、ボルト２２とナット２３を用いて歯体２４を回転部材２１の外周部２８に固定する。 The plurality of tooth bodies 24 are evenly arranged along the circumferential direction of the rotating member 21 and are fixed on the outer peripheral portion 28. In the present embodiment, the number of tooth bodies 24 is ten. Each tooth body 24 is a plate-like piece having substantially the same thickness in the axial direction as the intermediate portion 27 of the rotating member 21. Each tooth body 24 has an arc shape that matches the contour shape of the outer peripheral portion 28 of the rotating member 21. Two tooth portions 24 a that can mesh with the roller 16 of the chain 12 are formed on the outer peripheral edge of each tooth body 24. Each tooth body 24 has an inner peripheral portion and an outer peripheral portion, and a boundary between them is defined by a step 31. The thickness of the inner peripheral part is substantially half of the thickness of the outer peripheral part. Two holes 32 penetrating in the thickness direction are formed in the inner peripheral portion at positions corresponding to the tooth portions 24a in the radial direction. Bolts 22 can be inserted into the holes 32. When attaching the tooth body 24 to the rotating member 21, the tooth body 24 is positioned on the rotating member 21 so that the hole 32 of the tooth body 24 overlaps the hole 30 of the rotating member 21, and then the bolt 22 and the nut 23 are used. The tooth body 24 is fixed to the outer peripheral portion 28 of the rotating member 21.
　図３及び図４に示すように、各歯体２４を回転部材２１の外周部２８に固定するとき、回転部材２１と各歯体２４との間には、互いに異なる形状を有し、かつ互いに角度をなして回転部材２１上の異なる位置に配置される少なくとも２種類の弾性部材４１，４２が配置される。より具体的には、回転部材２１のラジアル方向における複数の歯体２４と回転部材２１の外周部２８との間には、外周部２８の厚さと略同一の幅を有する細い帯状に形成された複数（本実施形態では１０個）の第１の弾性部材４１が、外周部２８上の複数箇所（この場合、１０箇所）に、周方向に並んで配置される。各第１の弾性部材４１の長さは、歯体２４の段差３１の周方向の長さと略同一である。第１の弾性部材４１の材料としては、回転部材２１及び歯体２４の材料よりもヤング率が小さい金属材料（例えば、アルミニウムなど）が挙げられる。 As shown in FIGS. 3 and 4, when each tooth body 24 is fixed to the outer peripheral portion 28 of the rotating member 21, the rotating member 21 and each tooth body 24 have different shapes and are mutually different. At least two types of elastic members 41 and 42 arranged at different positions on the rotating member 21 at an angle are arranged. More specifically, between the plurality of tooth bodies 24 in the radial direction of the rotating member 21 and the outer peripheral portion 28 of the rotating member 21, a thin strip having the same width as the outer peripheral portion 28 is formed. A plurality (ten in this embodiment) of the first elastic members 41 are arranged side by side in the circumferential direction at a plurality of locations (10 locations in this case) on the outer peripheral portion 28. The length of each first elastic member 41 is substantially the same as the circumferential length of the step 31 of the tooth body 24. Examples of the material of the first elastic member 41 include a metal material (for example, aluminum) having a Young's modulus smaller than the material of the rotating member 21 and the tooth body 24.
　回転部材２１のアキシャル方向における複数の歯体２４と回転部材２１の外周部２８との間には、外周部２８のラジアル方向の長さと略同一のラジアル方向の長さを有する円弧状帯片に形成された複数（本実施形態では１０個）の第２の弾性部材４２が、外周部２８上の複数箇所（この場合、１０箇所）に、周方向に並んで配置される。各第２の弾性部材４２の周方向の長さは、歯体２４の周方向の長さと略同一である。第２の弾性部材４２の材料としては、回転部材２１及び複数の歯体２４の材料よりもヤング率が小さい金属材料（例えば、アルミニウムなど）が挙げられる。また、第２の弾性部材４２は、回転部材２１の外周部２８に形成された孔３０及び各歯体２４の内周側部位に形成された孔３２と同径かつ同一間隔の孔４３を有する。孔４３は、第２の弾性部材４２を厚さ方向に貫通している。第２の弾性部材４２は、その孔４３が回転部材２１の孔３０及び各歯体２４の孔３２と重なるように、歯体２４と回転部材２１の外周部２８との間に配置される。 Between the plurality of tooth bodies 24 in the axial direction of the rotating member 21 and the outer peripheral portion 28 of the rotating member 21, an arc-shaped strip having a radial length substantially the same as the radial length of the outer peripheral portion 28 is formed. A plurality (10 in this embodiment) of the formed second elastic members 42 are arranged side by side in a circumferential direction at a plurality of locations (10 locations in this case) on the outer peripheral portion 28. The circumferential length of each second elastic member 42 is substantially the same as the circumferential length of the tooth body 24. Examples of the material of the second elastic member 42 include a metal material (for example, aluminum) having a Young's modulus smaller than that of the rotating member 21 and the plurality of tooth bodies 24. The second elastic member 42 has holes 43 having the same diameter and the same interval as the holes 30 formed in the outer peripheral portion 28 of the rotating member 21 and the holes 32 formed in the inner peripheral side portion of each tooth body 24. . The hole 43 penetrates the second elastic member 42 in the thickness direction. The second elastic member 42 is disposed between the tooth body 24 and the outer peripheral portion 28 of the rotating member 21 so that the hole 43 overlaps the hole 30 of the rotating member 21 and the hole 32 of each tooth body 24.
　次に、上記のように構成されたチェーン駆動用のスプロケット１１の作用について説明する。 Next, the operation of the chain drive sprocket 11 configured as described above will be described.
　図１及び図４に示すように、スプロケット１１の外周に巻き掛けられたチェーン１２を駆動するとき、スプロケット１１は、歯体２４の歯部２４ａにチェーン１２のローラ１６を噛合させながら回転する。歯体２４の歯部２４ａにチェーン１２のローラ１６が噛合するとき、隣り合う２つの歯部２４ａ間の歯底に対し、ローラ１６がラジアル方向の外側から衝突する。そのため、ラジアル方向の内側に位置する回転部材２１には歯体２４を介してローラ１６の衝突による衝撃力が加わる。歯体２４に対するローラ１６の衝突は騒音を発生させる原因となり、その衝突の際の衝撃力が大きいほど騒音も大きくなる。したがって、このような衝撃力を小さくすることが望まれる。 As shown in FIGS. 1 and 4, when driving the chain 12 wound around the outer periphery of the sprocket 11, the sprocket 11 rotates while meshing the roller 16 of the chain 12 with the tooth portion 24 a of the tooth body 24. When the roller 16 of the chain 12 meshes with the tooth portion 24a of the tooth body 24, the roller 16 collides with the tooth bottom between the two adjacent tooth portions 24a from the outside in the radial direction. Therefore, an impact force due to the collision of the roller 16 is applied to the rotating member 21 located inside in the radial direction via the tooth body 24. The collision of the roller 16 with the tooth body 24 causes noise, and the greater the impact force at the time of the collision, the greater the noise. Therefore, it is desirable to reduce such an impact force.
　この点に関し、図４に示すように、回転部材２１のラジアル方向における歯体２４と回転部材２１の外周部２８との間には、第１の弾性部材４１が配置されている。この第１の弾性部材４１は、回転部材２１及び歯体２４の材料よりもヤング率が小さい金属材料で構成されている。そのため、この第１の弾性部材４１が、ローラ１６の衝突により歯体２４を介して回転部材２１へラジアル方向の外側から作用する衝撃力を吸収する。 In this regard, as shown in FIG. 4, a first elastic member 41 is disposed between the tooth body 24 in the radial direction of the rotating member 21 and the outer peripheral portion 28 of the rotating member 21. The first elastic member 41 is made of a metal material having a Young's modulus smaller than the material of the rotating member 21 and the tooth body 24. Therefore, the first elastic member 41 absorbs an impact force acting on the rotating member 21 from the outside in the radial direction via the tooth body 24 due to the collision of the roller 16.
　歯体２４の歯部２４ａにチェーン１２のローラ１６が噛合した状態では、そのローラ１６を間に挟んで対向する各対の内プレート１３の間及び各対の外プレート１４の間に、歯体２４の歯部２４ａがラジアル方向の内側から挿入されている。そのため、チェーン１２の駆動時において、そのチェーン１２が例えば撓んだりして振動した場合には、その振動が各歯部２４ａに対してアキシャル方向に作用する場合がある。この場合、歯体２４がチェーン１２から受けるアキシャル方向の振動は、スプロケット１１の回転部材２１にも伝播し、スプロケット１１を含むチェーン駆動機構の全体を振動させる原因にもなり得る。したがって、このような振動の伝播は抑制されることが望まれる。 In a state where the roller 16 of the chain 12 is engaged with the tooth portion 24a of the tooth body 24, the tooth body is interposed between each pair of the inner plates 13 and between each pair of the outer plates 14 with the roller 16 interposed therebetween. Twenty-four tooth portions 24a are inserted from the inside in the radial direction. For this reason, when the chain 12 is driven, for example, when the chain 12 is bent and vibrates, the vibration may act on each tooth portion 24a in the axial direction. In this case, the vibration in the axial direction that the tooth body 24 receives from the chain 12 propagates to the rotating member 21 of the sprocket 11 and may cause the entire chain drive mechanism including the sprocket 11 to vibrate. Therefore, it is desired that such vibration propagation be suppressed.
　この点に関し、図４に示すように、回転部材２１のアキシャル方向における歯体２４と回転部材２１の外周部２８との間には、第２の弾性部材４２が配置されている。この第２の弾性部材４２は、回転部材２１及び歯体２４の材料よりもヤング率が小さい金属材料で構成されている。そのため、この第２の弾性部材４２がチェーン１２から歯体２４を介して回転部材２１へ伝播するアキシャル方向の振動を減衰させる。 In this regard, as shown in FIG. 4, a second elastic member 42 is disposed between the tooth body 24 in the axial direction of the rotating member 21 and the outer peripheral portion 28 of the rotating member 21. The second elastic member 42 is made of a metal material having a Young's modulus smaller than the material of the rotating member 21 and the tooth body 24. Therefore, the second elastic member 42 attenuates the vibration in the axial direction that propagates from the chain 12 to the rotating member 21 via the tooth body 24.
　以上のように、第１の弾性部材４１はラジアル方向の衝撃を吸収し、第２の弾性部材４２はアキシャル方向の衝撃（振動を含む）を吸収する。したがって、チェーン１２から歯体２４を介して回転部材２１に作用する衝撃力の作用方向が、ラジアル方向やアキシャル方向など多岐に亘る場合であっても、各方向からの衝撃に対して第１の弾性部材４１及び第２の弾性部材４２のうちの何れかの弾性部材がその衝撃を吸収する。このように、少なくとも２種類の弾性部材４１，４２が、互いに異なる形状を有し、かつ互いに角度をなして回転部材２１上の異なる位置に配置されることにより、多様な衝撃が何れかの弾性部材により吸収されることになる。 As described above, the first elastic member 41 absorbs an impact in the radial direction, and the second elastic member 42 absorbs an impact in the axial direction (including vibration). Therefore, even when the direction of the impact force acting on the rotating member 21 from the chain 12 via the tooth body 24 is various, such as the radial direction and the axial direction, the first force is applied to the impact from each direction. Any one of the elastic member 41 and the second elastic member 42 absorbs the impact. As described above, the at least two types of elastic members 41 and 42 have different shapes and are arranged at different positions on the rotating member 21 at an angle to each other, so that various impacts can be applied to any one of the elastic members. It will be absorbed by the member.
　スプロケット１１において、歯体２４は剛性金属材料からなるボルト２２及びナット２３を用いて回転部材２１に固定されている。そのため、回転部材２１の回転時には、トルクが各弾性部材４１，４２を介することなく剛性ボルト２２などを通じて回転部材２１から各歯体２４へ直接的に作用する。すなわち、各歯体２４と回転部材２１の外周部２８との間に配置された各弾性部材４１，４２にはトルクがかからないため、各弾性部材４１，４２の疲弊を抑制することができる。 In the sprocket 11, the tooth body 24 is fixed to the rotating member 21 using a bolt 22 and a nut 23 made of a rigid metal material. Therefore, when the rotating member 21 is rotated, torque acts directly from the rotating member 21 to each tooth body 24 through the rigid bolt 22 or the like without passing through the elastic members 41 and 42. That is, since no torque is applied to the elastic members 41 and 42 disposed between the tooth bodies 24 and the outer peripheral portion 28 of the rotating member 21, the fatigue of the elastic members 41 and 42 can be suppressed.
　弾性部材４１，４２を交換する場合には、回転部材２１の周方向に並んで配置された複数の弾性部材４１，４２のうち、劣化などのために交換が必要とされる１つ又は複数の弾性部材４１，４２だけが交換される。新しく配置される１つ又は複数の弾性部材４１，４２は、回転部材２１及び複数の歯体２４の材料よりもヤング率が小さい材料でさえあれば、任意の材料で構成されることができる。したがって、新しく配置される１つ又は複数の弾性部材４１，４２の材料は、多種多様な材料の中から、使用環境に応じて適宜選択することができる。 When replacing the elastic members 41, 42, one or more of the plurality of elastic members 41, 42 arranged side by side in the circumferential direction of the rotating member 21 need to be replaced due to deterioration or the like. Only the elastic members 41, 42 are replaced. The one or more elastic members 41 and 42 to be newly disposed can be made of any material as long as the Young's modulus is smaller than the material of the rotating member 21 and the plurality of tooth bodies 24. Therefore, the material of the one or more elastic members 41 and 42 newly disposed can be appropriately selected from a wide variety of materials according to the use environment.
　上記第１実施形態によれば、以下のような効果を得ることができる。 According to the first embodiment, the following effects can be obtained.
　（１）回転部材２１と複数の歯体２４との間には、互いに異なる形状を有する少なくとも２種類の弾性部材４１，４２が、互いに角度をなして回転部材２１上の異なる位置に配置されている。そのため、チェーン１２の駆動時にチェーン１２から各歯体２４に加わる衝撃力の作用方向が多岐に亘る場合であっても、各方向からの衝撃に対して何れかの弾性部材４１，４２がその衝撃を効果的に吸収する。したがって、チェーン１２の駆動時にチェーン１２から各歯部２４に対し多様な衝撃が加わる場合にも、その衝撃の吸収し、騒音を低減することができる。 (1) Between the rotating member 21 and the plurality of tooth bodies 24, at least two types of elastic members 41 and 42 having different shapes are arranged at different positions on the rotating member 21 at an angle. Yes. Therefore, even when the direction of action of the impact force applied from the chain 12 to each tooth body 24 when the chain 12 is driven varies, any of the elastic members 41 and 42 against the impact from each direction. Absorbs effectively. Therefore, even when various impacts are applied from the chain 12 to each tooth portion 24 when the chain 12 is driven, the impact can be absorbed and noise can be reduced.
　（２）チェーン１２が歯部２４ａに噛合するとき、歯体２４に加わる回転部材２１のラジアル方向の衝撃は、第１の弾性部材４１により吸収される。さらに、チェーン１２が歯部２４ａに噛合するとき、歯体２４は回転部材２１のアキシャル方向に振動することがある。しかしながら、そのような振動は第２の弾性部材４２により減衰される。その結果、騒音を効果的に低減することができる。 (2) When the chain 12 meshes with the tooth portion 24 a, the radial impact of the rotating member 21 applied to the tooth body 24 is absorbed by the first elastic member 41. Furthermore, when the chain 12 meshes with the tooth portion 24 a, the tooth body 24 may vibrate in the axial direction of the rotating member 21. However, such vibration is damped by the second elastic member 42. As a result, noise can be effectively reduced.
　（３）回転部材２１が回転するとき、回転部材２１と歯体２４との間に配置されている弾性部材４１，４２にはトルクがかからないため、弾性部材４１，４２の疲弊を抑制することができる。 (3) Since the torque is not applied to the elastic members 41 and 42 arranged between the rotating member 21 and the tooth body 24 when the rotating member 21 rotates, the fatigue of the elastic members 41 and 42 can be suppressed. it can.
　（４）回転部材２１の周方向全体に亘る円環状の一体型弾性部材とは異なり、本実施形態における複数の弾性部材４１，４２は周方向に並んで配置されている。そのため、弾性部材４１，４２を交換する場合、複数の弾性部材４１，４２のうち、劣化などのために交換が必要とされる弾性部材だけを交換すればよい。したがって、弾性部材４１，４２の交換に関わるコストを低減できる。 (4) Unlike the annular integrated elastic member extending over the entire circumferential direction of the rotating member 21, the plurality of elastic members 41 and 42 in the present embodiment are arranged side by side in the circumferential direction. Therefore, when replacing the elastic members 41 and 42, it is only necessary to replace only the elastic member that needs to be replaced due to deterioration or the like among the plurality of elastic members 41 and 42. Therefore, the cost relating to the replacement of the elastic members 41 and 42 can be reduced.
　（５）複数の弾性部材４１，４２の材料は、回転部材２１及び歯体２４の材料よりもヤング率が小さいことのみを条件として、多種多様な材料の中から、使用環境に応じて適宜選択することができる。 (5) The materials of the plurality of elastic members 41 and 42 are appropriately selected from a wide variety of materials according to the use environment, only on the condition that the Young's modulus is smaller than the materials of the rotating member 21 and the tooth body 24. can do.
　（第２実施形態）
　次に、第２実施形態のスプロケットについて図５を参照しながら説明する。第２実施形態のスプロケットは、第１実施形態の場合とは異なる複数の歯体を有する。その他の点では、第２実施形態のスプロケットは第１実施形態とほぼ同じである。図５において、第１実施形態と同一の構成要素については同一符号を付すことによって重複した説明は省略する。 (Second Embodiment)
Next, the sprocket of 2nd Embodiment is demonstrated, referring FIG. The sprocket of the second embodiment has a plurality of tooth bodies different from the case of the first embodiment. In other respects, the sprocket of the second embodiment is substantially the same as the first embodiment. In FIG. 5, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
　図５に示すように、本実施形態のスプロケット５１は、回転部材２１の外周にボルト２２により固定される複数の歯体２４を備える。各歯体２４の外周縁には、チェーン１２の長さに沿って所定間隔を置いて配置された複数のローラ１６のうちの隣り合う２つのローラ１６と噛合可能な１つの歯部２４ａが形成されている。すなわち、第１実施形態のスプロケット１１では各歯体２４が２つの歯部２４ａを有するのに対し、第２実施形態のスプロケット５１では歯体２４は１つの歯部２４ａを有する。そのため、チェーン１２の駆動時には、チェーン１２のローラ１６が２つ毎に１つの歯部２４ａと噛合した状態でスプロケット５１が回転する。 As shown in FIG. 5, the sprocket 51 of this embodiment includes a plurality of tooth bodies 24 fixed to the outer periphery of the rotating member 21 by bolts 22. On the outer peripheral edge of each tooth body 24, one tooth portion 24 a that can mesh with two adjacent rollers 16 among the plurality of rollers 16 arranged at predetermined intervals along the length of the chain 12 is formed. Has been. That is, in the sprocket 11 of the first embodiment, each tooth body 24 has two tooth portions 24a, whereas in the sprocket 51 of the second embodiment, the tooth body 24 has one tooth portion 24a. Therefore, when the chain 12 is driven, the sprocket 51 rotates in a state in which every two rollers 16 of the chain 12 are engaged with one tooth portion 24a.
　図５には示されていないが、各歯体２４と回転部材２１の外周部２８との間には、第１実施形態の場合と同様に、互いに異なる形状を有する第１の弾性部材４１及び第２の弾性部材４２が、互いに角度をなして外周部２８上の異なる位置に配置されている。そのため、この第２実施形態においても、チェーン１２から歯体２４を介して回転部材２１に加わる衝撃力の作用方向が、ラジアル方向やアキシャル方向など多岐に亘る場合であっても、各方向からの衝撃に対して第１の弾性部材４１及び第２の弾性部材４２のうちの何れかの弾性部材がその衝撃を吸収する。 Although not shown in FIG. 5, between each tooth body 24 and the outer peripheral portion 28 of the rotating member 21, as in the case of the first embodiment, the first elastic member 41 having different shapes and The second elastic members 42 are arranged at different positions on the outer peripheral portion 28 at an angle to each other. Therefore, even in the second embodiment, even when the direction of action of the impact force applied to the rotating member 21 from the chain 12 via the tooth body 24 is diverse, such as the radial direction and the axial direction, Any one of the first elastic member 41 and the second elastic member 42 absorbs the impact against the impact.
　この第２実施形態によれば、第１実施形態における（１）～（５）の効果に加えて、さらに以下のような効果を得ることができる。 According to the second embodiment, in addition to the effects (1) to (5) in the first embodiment, the following effects can be obtained.
　（６）スプロケット５１の各歯体２４は歯部２４ａを１つだけ有するので、各歯体２４が２つの歯部２４ａを有するスプロケット１１の場合よりも、少なくとも歯部２４ａの減少分だけスプロケットの重量を低減できる。 (6) Each tooth body 24 of the sprocket 51 has only one tooth portion 24a, so that each tooth body 24 has at least the reduction of the tooth portion 24a as compared with the case of the sprocket 11 having two tooth portions 24a. Weight can be reduced.
　次に、第３実施形態のスプロケットについて図６を参照しながら説明する。第３実施形態のスプロケットは、第１実施形態の場合とは異なる複数の弾性部材を有する。その他の点では、第３実施形態のスプロケットは第１実施形態とほぼ同じである。図６において、第１実施形態と同一の構成要素については同一符号を付すことによって重複した説明は省略する。 Next, the sprocket of the third embodiment will be described with reference to FIG. The sprocket of the third embodiment has a plurality of elastic members different from the case of the first embodiment. In other respects, the sprocket of the third embodiment is substantially the same as the first embodiment. In FIG. 6, the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.
　図６に示すように、本実施形態のスプロケット６１において、各歯体２４と回転部材２１の外周部２８との間に配置される第１の弾性部材４１及び第２の弾性部材４２は、それぞれスプロケット６１の周方向全体に亘って連続する円環状の一体型弾性部材である。なお、第１実施形態の場合と同様に、第１の弾性部材４１は回転部材２１のラジアル方向における各歯体２４と回転部材２１の外周部２８との間に配置され、第２の弾性部材４２はアキシャル方向における各歯体２４と回転部材２１の外周部２８との間に配置されている。 As shown in FIG. 6, in the sprocket 61 of the present embodiment, the first elastic member 41 and the second elastic member 42 arranged between each tooth body 24 and the outer peripheral portion 28 of the rotating member 21 are respectively This is an annular integrated elastic member that is continuous over the entire circumferential direction of the sprocket 61. As in the case of the first embodiment, the first elastic member 41 is arranged between each tooth body 24 in the radial direction of the rotating member 21 and the outer peripheral portion 28 of the rotating member 21, and the second elastic member 42 is arranged between each tooth body 24 and the outer peripheral portion 28 of the rotating member 21 in the axial direction.
　本実施形態における第１の弾性部材４１及び第２の弾性部材４２は、第１実施形態の場合と同様に、互いに異なる形状を有し、かつ互いに角度をなして回転部材２１上の異なる位置に配置される少なくとも２種類の弾性部材である。そのため、この第３実施形態においても、チェーン１２から歯体２４を介して回転部材２１に加わる衝撃力の作用方向が、ラジアル方向やアキシャル方向など多岐に亘る場合であっても、各方向からの衝撃に対して第１の弾性部材４１及び第２の弾性部材４２のうちの何れかの弾性部材がその衝撃を吸収する。 As in the case of the first embodiment, the first elastic member 41 and the second elastic member 42 in the present embodiment have different shapes and are angled with each other at different positions on the rotating member 21. There are at least two types of elastic members arranged. Therefore, even in the third embodiment, even when the direction of action of the impact force applied to the rotating member 21 from the chain 12 via the tooth body 24 is various, such as the radial direction and the axial direction, Any one of the first elastic member 41 and the second elastic member 42 absorbs the impact against the impact.
　この第３実施形態によれば、第１実施形態における（１）～（３）及び（５）の効果に加えて、さらに以下のような効果を得ることができる。 According to the third embodiment, in addition to the effects (1) to (3) and (5) in the first embodiment, the following effects can be obtained.
　（７）第１の弾性部材４１及び第２の弾性部材４２は、それぞれ回転部材２１の周方向全体に亘って連続する円環状の一体型弾性部材である。そのため、複数の弾性部材を回転部材２１の外周部２８の周方向に並べて配置する場合よりも、弾性部材を外周部２８上に容易に配置することができる。 (7) The first elastic member 41 and the second elastic member 42 are each an annular integral elastic member that is continuous over the entire circumferential direction of the rotating member 21. Therefore, the elastic member can be arranged on the outer peripheral portion 28 more easily than the case where a plurality of elastic members are arranged side by side in the circumferential direction of the outer peripheral portion 28 of the rotating member 21.
　上記各実施形態は以下のように変更してもよい。 The above embodiments may be modified as follows.
　・上記各実施形態において、弾性部材４１，４２の材料は、回転部材２１及び歯体２４の材料よりもヤング率の小さい材料であればよい。したがって、弾性部材４１，４２の材料は、アルミニウム以外に、例えばゴムや制振鋼板などであってもよく、多種多様な材料から使用環境に応じて適宜選択可能である。 In the above embodiments, the elastic members 41 and 42 may be made of a material having a Young's modulus smaller than those of the rotating member 21 and the tooth body 24. Therefore, the material of the elastic members 41 and 42 may be, for example, rubber or a vibration-damping steel plate other than aluminum, and can be appropriately selected from a wide variety of materials according to the use environment.
　・上記各実施形態において、回転部材２１の周方向に並んで配置される各弾性部材４１，４２の周方向の長さは、１つの歯体２４の周方向の長さと同じでなくてもよい。例えば、各弾性部材４１，４２の周方向の長さは、２つ又は３つの歯体２４の周方向の長さの合計と同じであってもよい。 In each of the above embodiments, the length in the circumferential direction of each elastic member 41, 42 arranged side by side in the circumferential direction of the rotating member 21 may not be the same as the length in the circumferential direction of one tooth body 24. . For example, the length in the circumferential direction of each elastic member 41, 42 may be the same as the sum of the lengths in the circumferential direction of the two or three tooth bodies 24.
　・上記各実施形態において、各歯体２４を回転部材２１に固定する剛性固定部材は、ピンやクリップなどのボルト２２以外の固定部材であってもよい。また、その固定部材の材料は鉄以外の剛性材料であってもよく、例えばステンレス鋼などの剛性金属材料でもよい。 In each of the above embodiments, the rigid fixing member that fixes each tooth body 24 to the rotating member 21 may be a fixing member other than the bolt 22 such as a pin or a clip. Further, the material of the fixing member may be a rigid material other than iron, for example, a rigid metal material such as stainless steel.
　・上記各実施形態において、第１の弾性部材４１及び第２の弾性部材４２のうち少なくとも一方の長さをさらに延長し、延長された部分を、回転部材２１の周方向において隣り合う２つの歯体２４の間に挟み込まれ得る弾性片としてもよい。 In each of the above embodiments, the length of at least one of the first elastic member 41 and the second elastic member 42 is further extended, and the extended portion is replaced with two teeth adjacent in the circumferential direction of the rotating member 21. It is good also as an elastic piece which can be pinched | interposed between the bodies 24. FIG.
　・上記各実施形態において、第１の弾性部材４１の材料及び第２の弾性部材４２の材料は、それらの材料が回転部材２１及び歯体２４の材料よりもヤング率が小さいという条件で、互いに異なっていてもよい。その場合、第１の弾性部材４１の材料のヤング率と第２の弾性部材４２の材料のヤング率は異なっていてもよい。 In each of the above embodiments, the materials of the first elastic member 41 and the material of the second elastic member 42 are mutually on condition that the Young's modulus is smaller than the materials of the rotating member 21 and the tooth body 24. May be different. In that case, the Young's modulus of the material of the first elastic member 41 and the Young's modulus of the material of the second elastic member 42 may be different.
　１１，５１，６１…スプロケット、１２…チェーン、２１…回転部材、２２…ボルト、２４…歯体、２４ａ…歯部、４１…第１の弾性部材、４２…第２の弾性部材、Ｐ…軸線。 DESCRIPTION OF SYMBOLS 11,51,61 ... Sprocket, 12 ... Chain, 21 ... Rotating member, 22 ... Bolt, 24 ... Tooth body, 24a ... Tooth part, 41 ... First elastic member, 42 ... Second elastic member, P ... Axis .

Claims (5)

  1. チェーン駆動用のスプロケットであって、
    　回転軸線を有する回転部材と、
    　前記回転部材の外周に沿って配置されると共に前記回転部材に支持される複数の歯体であって、前記複数の歯体の各々がチェーンの一部と噛合可能な１つ又は複数の歯部を有する前記複数の歯体と、
    　前記回転部材と前記複数の歯体との間に配置されると共に、前記チェーンから前記複数の歯体に加わる衝撃を吸収するように構成された複数の弾性部材と
    を備え、
    　前記複数の弾性部材は、互いに異なる形状を有し、かつ互いに角度をなして前記回転部材上の異なる位置に配置される少なくとも２種類の弾性部材からなることを特徴とするチェーン駆動用のスプロケット。     A sprocket for driving a chain,
    A rotating member having a rotational axis;
    A plurality of tooth bodies arranged along an outer periphery of the rotating member and supported by the rotating member, wherein each of the plurality of tooth bodies can mesh with a part of a chain. The plurality of tooth bodies,
    A plurality of elastic members arranged between the rotating member and the plurality of tooth bodies and configured to absorb an impact applied to the plurality of tooth bodies from the chain;
    The sprocket for chain driving characterized in that the plurality of elastic members are formed of at least two types of elastic members having different shapes and arranged at different positions on the rotating member at an angle to each other.
  2. 前記少なくとも２種類の弾性部材は、前記回転部材のラジアル方向における前記回転部材と前記複数の歯体との間に配置される第１の弾性部材と、前記回転部材のアキシャル方向における前記回転部材と前記複数の歯体との間に配置される第２の弾性部材とを含むことを特徴とする請求項１に記載のチェーン駆動用のスプロケット。 The at least two types of elastic members include a first elastic member disposed between the rotating member and the plurality of tooth bodies in a radial direction of the rotating member, and the rotating member in an axial direction of the rotating member; The sprocket for chain driving according to claim 1, further comprising a second elastic member disposed between the plurality of tooth bodies.
  3. 前記複数の歯体の各々は、少なくとも１つの剛性固定部材により前記回転部材に固定されることを特徴とする請求項１又は２に記載のチェーン駆動用のスプロケット。 3. The chain drive sprocket according to claim 1, wherein each of the plurality of tooth bodies is fixed to the rotating member by at least one rigid fixing member. 4.
  4. 前記少なくとも２種類の弾性部材は、それぞれ、前記回転部材の周方向に沿って互いに独立して配置可能な複数の弾性部材からなることを特徴とする請求項１～３の何れか一項に記載のチェーン駆動用のスプロケット。 The at least two types of elastic members are each composed of a plurality of elastic members that can be arranged independently of each other along the circumferential direction of the rotating member. Chain drive sprocket.
  5. 前記少なくとも２種類の弾性部材は、前記回転部材及び前記複数の歯体よりもヤング率が小さい材料で構成されていることを特徴とする請求項１～４の何れか一項に記載のチェーン駆動用のスプロケット。 The chain drive according to any one of claims 1 to 4, wherein the at least two kinds of elastic members are made of a material having a Young's modulus smaller than that of the rotating member and the plurality of tooth bodies. Sprocket.
PCT/JP2014/054434 2013-05-30 2014-02-25 Chain driving sprocket WO2014192339A1 (en)

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JPS6451593U (en) * 1987-09-28 1989-03-30
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JPH074945U (en) * 1993-06-14 1995-01-24 エヌ・オー・ケー・メグラスティック株式会社 Torsional damper
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JP2014231895A (en) 2014-12-11
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KR20160003041A (en) 2016-01-08
KR101821875B1 (en) 2018-01-24

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