M357421 五、新型說明： ： 【新型所屬之技術領域】 : I創作係有關於-種鏈條之潤滑構造，係於鍵條 之各組成零件上披覆一無電解鎳層以及一聚四氟乙 稀合金層，而可自動潤滑，並增加鍵條表面硬度，增 長使用壽命’且不影響其抗拉強度者。 θ 【先前技術】 •按，鏈條於組裝完成後，需浸潰於具溫度而液化 之潤滑液中’當潤滑液回復常溫時即成為濃稠狀之潤 滑油’而均句披覆於鏈條上’當濃稠潤滑油使用日久 會消耗減少，且鏈條會逐漸覆蓋泥沙，有時泥沙亦會 結合剩餘之潤滑油，導致鍵條之順暢度降低，而即二 再使用液狀之潤滑液，亦會因結合了泥沙的潤滑油阻 塞，而使液狀濁滑液無法渗入鍵條之鍵轴内部，鍵條 •:運：：是不順暢，且鏈軸容易生鑛，又鏈條使用 鲁時’其潤滑油料因使用者不慎而沾到衣服。 - 另，中華民國證書號數M2751 60號「改良型自行 '車鏈條」，其亦有上述之缺失，如第八圖所示，該鏈 片（A)之内凸緣（A1)組裝後係埋入鏈輥（B)内，導致潤 2油無法順利流入鏈軸⑹，鏈軸(c)容易生鏽，並增 鏈片（A)之磨耗而降低鏈條之使用壽命。 【新型内容】 鏈條本創作開發出一種鏈條之潤滑構造，係於 、、且成零件上披覆一無電解鎳層，再披覆一聚 3 M357421 =乙烯合金層（聚四氟 :自動潤滑，並增力，条表面硬度，增=命而 且不影響其抗拉強度。 日⑽用w 杜ί!!作為一種鍵條之潤滑構造，係使用於鏈條組 件’:特徵在於鏈條之龍構造包含： I ] π層，披覆於鏈條組件表面，厚度為2至 ;只"），其係為一無電解鎳層；M357421 V. New description: : [New technical field]: I Creation Department has a lubrication structure for a kind of chain, which is coated with an electroless nickel layer and a polytetrafluoroethylene layer on each component of the key strip. The alloy layer, which can be automatically lubricated, increases the surface hardness of the key bar, and increases the service life' without affecting its tensile strength. θ [Prior Art] • After the assembly is completed, the chain needs to be immersed in the lubricating fluid with temperature and liquefaction. 'When the lubricating fluid returns to normal temperature, it becomes a thick lubricating oil' and the average sentence is covered on the chain. 'When the thick lubricating oil is used for a long time, the consumption will be reduced, and the chain will gradually cover the sediment. Sometimes the sand will also combine with the remaining lubricating oil, resulting in a decrease in the smoothness of the key strip, that is, the use of liquid lubrication. The liquid will also be blocked by the lubricating oil combined with the sediment, so that the liquid turbid liquid can not penetrate into the key shaft of the key bar, the key bar:: transport: is not smooth, and the chain shaft is easy to produce ore, and the chain When using Lu, 'the lubricant material is stained by the user. - In addition, the Republic of China Certificate No. M2751 No. 60 "Modified Self-Car Chain" has the above-mentioned defects. As shown in the eighth figure, the inner flange (A1) of the chain (A) is assembled. Buried in the chain roller (B), the Run 2 oil cannot flow smoothly into the chain shaft (6), the chain shaft (c) is apt to rust, and the wear of the chain piece (A) is increased to reduce the service life of the chain. [New content] The chain has created a lubrication structure for the chain, which is coated with an electroless nickel layer on the part, and then covered with a layer of 3 M357421 = vinyl alloy layer (polytetrafluoroethylene: automatic lubrication, And increase the force, the surface hardness of the strip, increase the life and does not affect its tensile strength. Day (10) with w Du ί!! As a lubrication structure of the key strip, used in the chain assembly ': characterized by the chain dragon structure contains: I ] π layer, coated on the surface of the chain assembly, having a thickness of 2 to; only "), which is an electroless nickel layer;
他第二潤滑層’披覆於第-潤滑層表面，厚度2至 /米（#)，其係為一聚四氟乙烯合金層，包含體 積百分率為3至35vol%之聚四氟乙烯（pTFE)。 上述之鏈條之潤滑構造，纟中該鍵條組件係為鏈 輥、鏈轴、内鏈板、外鏈板或襯套之任一種或其組合。 上述之鏈條之潤滑構造，其中該鏈條組件係以 八族元素為其材質。 日上述之鏈條之潤滑構造，其中無電解鎳層包含： 重里百分率為6至13wt%之磷以及87至94wt%之 _上述之鏈條之潤滑構造，其中聚四氟乙烯合金層 3有體積百分率為：20至35vol%之聚四氟乙烯 (PTFE)’其密度為5 9至6.8g/on3 ，故換算之重量 百分率係6至12. 5wt%。 入上述之鏈條之潤滑構造，該聚四氟乙烯合金層更 含有重量百分率為7.5至10wt%之磷、77至86wBt% 4 M357421 之鎳。 上述之鏈條之潤滑構造，係於第二潤滑層上更披 覆有強化層或烤漆層之任一種。 本創作具有下列優點： 1. 本創作之第一潤滑層係為無電解鎳層，其鍍膜 均勻、附著性強、硬度高、耐磨耗、抗蝕性佳、可^ 接、鍍層硬度在HV500度以上（HRC5〇)，如經過再^ -理則鍍層硬度可達HV1 000度（HRC70)，可提升鏈ς _ 造之硬度。 ' 2. 本創作之第二潤滑層係將聚四氟乙烯 (Polytetraf luoroethylene ; PTFE)粒子以特定的 含里（3至3 2vol%)分散共析於無電鍍鎳層中，具有下 列特點’以提供鏈條潤滑功能： (1 )低摩擦係數，幾乎所有固體中最低， 滑度佳。 _ 潤 | ( 2 )特佳的耐溫性。 - (3 )極強的化學穩定性’幾乎不被任何化風蘸 品所侵蝕。 予果 (4 )表面不枯性。 (5 )優異的電絕緣性能，在寬廣的頻率範圍内 介電常數穩定且值最小。 (6 )極佳的耐老化性能’不受氧氣、臭氣、 外線作用。 ~ (7 )極可貴的不燃性。 5 M357421 (8 )極小的吸水率。 3·本創作使用之無電鑛錄層可錢於第八族元素 及其合金、不銹鋼、銅及1入全 ’、 、口金鋁及其合金、鈦及 其5金以及鎮及立会·全所—μ ,知 、口 I為材質之鏈條組件上，應 相當廣泛。 ~ 【實施方式】 本第一實施例為一種鏈條之潤滑構造，係使用於 鏈條組件，其係以第八族元素（即鐵、銘、錄、釘、 錄、把、锇、銀、銘）及其合金為主要材質，”請參考 第一圖所示，鏈條組件包括： 内鏈片（1 )，係一組兩片，相對設置，該内鏈片 (1 )设有第一樞接孔（1丨）。請參考第二圖所示，該内 鏈片（1)設有第一潤滑層（i 2 )以及第二潤滑層（J 3 )， 其中： 第一潤滑層（12)彼覆於内鏈片（1)表面，厚 • 度為2至5微米（#m)，其係為一無電解鎳層，該無 -電解錄層包含重量百分率為6至I3wt%之磷以及87 至94wt %之鎳’本第一實施例中無電解鎳層磷佔 llwt% ’錄佔89wt%。各種不同鱗、鎳比例之無電 解鎳層物理特性歸納如下表一： 型號規格 9 15 1 115 7 5 4 組織 片顆粒 顆粒 顆粒 光澤 光澤 半光澤 半光澤 — 6 M357421 磷含量 (wt% ) 6至9 11 至 13 7至9 熔點 960。。 860〇C 890〇C 比重 8. 2 7. 9 8. 0 電氣阻抗 60 60 60 // Ω /cm 熱膨脹數 13 至 15 13 15 β ra/m*°C 硬度（HV) 619 556 594 經 350〇C，1 1009 1002 1130 小時加熱後 之硬度（HV) 應力 半壓縮 壓縮 壓縮 磁性 微磁性 無磁性 無磁性 密著（psi ) 50000 至 50000 至 50000 至 70000 70000 70000 对#性 〇 ◎ ◎ 耐藥品 〇 ◎ ◎ 均一性 ± 5 %以下 ± 5 %以下 ± 5 %以下 析出速度 22 15 15 (β m/hr ) M3 5 7421 未檢出 lOOppm 650ppm 又’遠無電鍵錄層可鍵於第八族元素及其合金、 不銹鋼、銅及其合金、鋁及其合金、鈦及其合金以及 鎂及其合金上，應用性相當廣泛。 第二潤滑層（13 )，披覆於第一潤滑層（12 )表 面，厚度2至8微米（#m)，其係為一聚四氟乙烯合 金層，係將聚四氟乙烯（P〇lytetraflu〇r〇ethylene ; PTFE)粒子以特定的含量（3至32v〇1%)分散共析於無 電鍍鎳層中，包含體積百分率為3至35vol%之聚四 氟乙稀（PTFE)。本第一實施例採用聚讀乙稀合金 層體積百分率為：2〇至35v〇1%之聚四氟乙烯，其密 度為5.9至6.8g/cm3 ，故換算之重量百分率係6至 12.5wt%，並含有重量百分率為75至1〇紂％之磷、 Π至86wt%之鎳，在第二潤滑層（13)上亦可進行 後續加工’例如錢上—氮化欽層作為強化層或者以烤 漆加工處理。 金層物理I生質比較^ 低含量聚四氟^ ^ I λ, 表為無電解鎳層與添加不同比例之聚四氟乙 低含量聚四氟 乙烯合金層 山a 焉含量聚四氟 乙稀合金層 _------ 無電解鎳 層 鎳（wt% ) 83 至 86 77 至 83 —---- 88 至 92 磷（wt%) 7. 5 至 9 ------ _8j； 1〇 — 8至12 M357421 聚四氟乙烯 (wt% ) 6 至 8. 5 (20 至 25vol % ) 9· 5 至 12. 5 (29 至 35vol % ) 0 聚四氟 乙稀 0. 2 至 0. 4 0. 2 至 0· 4 無 粒徑（ β m) 密度 6. 4 至 6. 8 5. 9 至 6. 3 7. 9 g/cm3 硬度 熱處 250 至 350 200 至 300 500 至 550 (HV) 理前 熱處 400 至 500 350 至 450 550 至 900 理後 表三為聚四氟乙烯合金層與習知低摩擦係數材 質之摩擦係數比較： 靜摩擦係數 動摩擦係數 聚四氟乙烯合 0. 134 0.097 金層 無電解鎳 0. 191 0. 144 冷軋不銹鋼板 0. 507 0. 427 (SPCC) 銅 0. 232 0.146 鋁 0.171 0.106 外鏈片（2 )，係一組兩片，相對設置於内鏈片（1) M357421 外側，5亥外鏈片（2)設有第二拖接孔（2 i)，該第二柩 :接孔（21)係對應内鏈片⑴之第一枢接孔⑴）。請參 :考第三圖所示，該外鏈片亦設有第-潤滑層（22)以 及第二潤滑層（23)，其特性請參考内鏈片（1)之描 述’於此不再贅述。 鏈輥（3)，係圓環狀，具有穿孔（31)，設入於每 組内鏈片（1)之間。請參考第四圖所示，該鏈輥（3) 亦δ又有第一潤滑層（32 )以及第二潤滑層（33 )，其 罾特性請參考内鏈片（1)之描述。 鏈軸（4)，係穿設過鏈輥之穿孔（31)，並樞 接於每一相鄰外鏈片第二樞接孔（21)及内鏈片（1)之 第一樞接孔（11)。請參考第五圖所示，該鏈軸亦 設有第一潤滑層（41)以及第二潤滑層（42)，其特 性請參考内鏈片（1)之描述。 本創作之第二實施例為一種鏈條之潤滑構造，請 #參考第六圖所示，與第一實施例不同之處在於，本第 二實施例之鏈條組件更增設有襯套（5)，具有一穿孔 (51 )’設入於每一組内鏈片（1)之間，並容設於前述 之鏈輥（3)内而可轉動，如第七圖所示，該襯套 亦設有第一潤滑層（52 )以及第二潤滑層（53 )，其 特性請參考第一實施例之内鏈片（1 )描述。 綜合上述’本創作各實施例之各第一潤滑層 (12)、（22)、（32)、（41)、（52)係為無電解鎳層， 其鍍膜均勻、附著性強、硬度高、耐磨耗、抗蝕性佳、 M357421 可焊接、鍍層硬度在HV500度以上（HRC50)，如經過 :再處理則鍍層硬度可達HV1 000度（HRC7〇)，可提升鏈 条構之硬度。又，本創作各實施例之各第二潤滑層 ' ( 23)、（ 33)、（ 42)、（ 53)係為聚四氟乙烯合 金層’具有低摩擦係|，由表三去口，聚四氟乙烯合金 a之摩擦係數較習知低摩擦係數材質更低，故潤滑度 佳，並具有表面不黏性，避免黏附污物而使鏈條之運 鲁作不順暢’且第：潤滑層具特佳之耐溫性、電絕緣 性、耐老化性、不燃性、化學穩定性強、極小的吸水 率，故本創作可長久使用不需時常更換，實為一而可 自動潤滑，並增加鏈條表面硬度，增長使用壽命，且 不影響其抗拉強度之鏈條之潤滑構造。 【圖式簡單說明】 •第—圖㈣本㈣帛一實施例之鏈條組件組 圖。 第一圖係為本創作第一實施例中内鏈片構造之剖视 圖0 第二圖係為本創作第一實施例中外鏈片構造之 圖。 & 第四圖係為本創作第一實施例中鏈報構造之剖視圖。 第五圖係為本創作第一實施例中鍵轴構造之剖視圖。 第六圖係為本創作第二實施例之鏈條剖視圖。 11 M3 5 7421 第七圖係為本創作第二實施例中襯套構造之剖視圖。 ； 第八圖係為習知鏈條構造示意圖。 【主要元件符號說明】 (1) 内鏈片 (11) 第一樞接孔 (12) 第一潤滑層 (13) 第二潤滑層 (2) 外鏈片 (21) 弟二枢接孔 (22) 第一潤滑層 (23) 第二潤滑層 (3) 鏈輥 (31) 穿孔 (32) 第一潤滑層 (33) 第二潤滑層 (4) 鏈轴 (41 ) 第一潤滑層 (42) 第二潤滑層 (5) 襯套 (51) 穿孔 (52) 第一潤滑層 (53) 第二潤滑層 (A) 鍵片 (A1) 内凸緣 (B) 鏈輥 (C) 鏈轴 12The second lubricating layer is 'coated on the surface of the first lubricating layer, and has a thickness of 2 to /m (#), which is a polytetrafluoroethylene alloy layer containing polytetrafluoroethylene (pTFE) in a volume percentage of 3 to 35 vol%. ). In the above-described chain lubrication structure, the key bar assembly is any one or a combination of a chain roller, a chain shaft, an inner chain plate, an outer chain plate or a bushing. The above-described chain lubrication structure, wherein the chain component is made of an element of a group of eight. The lubricating structure of the above-mentioned chain, wherein the electroless nickel layer comprises: a phosphorus having a percentage of 6 to 13 wt% and a lubricating structure of 87 to 94 wt% of the above-mentioned chain, wherein the polytetrafluoroethylene alloy layer 3 has a volume fraction 5重量%。 The weight percentage of the conversion is from 6 to 12. 5wt%. In the lubricating structure of the above chain, the polytetrafluoroethylene alloy layer further contains 7.5 to 10% by weight of phosphorus and 77 to 86% by weight of 4 M357421 of nickel. The lubricating structure of the above chain is any one of a reinforcing layer or a lacquer layer which is further coated on the second lubricating layer. This creation has the following advantages: 1. The first lubricating layer of this creation is an electroless nickel layer, which has uniform coating, strong adhesion, high hardness, wear resistance, good corrosion resistance, and can be connected and the hardness of the coating is HV500. Above the degree (HRC5〇), if the hardness is HV1 000 (HRC70), the hardness of the chain _ can be improved. 2. The second lubricating layer of this creation is to disperse polytetrafluoroethylene (PTFE) particles in a specific lining (3 to 32 vol%) in an electroless nickel layer with the following characteristics. Provides chain lubrication: (1) Low coefficient of friction, the lowest of all solids, good slip. _ Run | ( 2 ) Excellent temperature resistance. - (3) Extremely strong chemical stability' is hardly eroded by any wind. Pre-fruit (4) The surface is not dry. (5) Excellent electrical insulation properties, stable dielectric constant and minimum value over a wide frequency range. (6) Excellent aging resistance' is not affected by oxygen, odor or external lines. ~ (7) Extremely valuable non-combustible. 5 M357421 (8) Very low water absorption. 3. The electroless mineral recording layer used in this creation can be used in the eighth element and its alloys, stainless steel, copper and 1 into the whole ', , gold and aluminum alloys, titanium and its 5 gold, and the town and the general meeting. μ, know, port I is the material chain component, should be quite extensive. [Embodiment] The first embodiment is a lubrication structure of a chain, which is used in a chain assembly, which is an element of the eighth group (ie, iron, Ming, recorded, nailed, recorded, put, 锇, silver, Ming) And its alloy is the main material," please refer to the first figure, the chain assembly includes: the inner chain piece (1), which is a set of two pieces, oppositely arranged, the inner chain piece (1) is provided with a first pivot hole (1丨). Please refer to the second figure, the inner chain piece (1) is provided with a first lubricating layer (i 2 ) and a second lubricating layer (J 3 ), wherein: the first lubricating layer (12) Covering the surface of the inner chain sheet (1), the thickness is 2 to 5 micrometers (#m), which is an electroless nickel layer, and the electroless recording layer contains 6 to 13 wt% of phosphorus and 87 parts by weight. To 94wt% nickel' in the first embodiment, the electroless nickel layer llwt% accounted for 89wt%. The physical properties of the electroless nickel layer of various scales and nickel ratios are summarized as follows: Model specification 9 15 1 115 7 5 4 Tissue flakes Granular particles Glossy luster Semi-gloss semi-gloss — 6 M357421 Phosphorus content (wt%) 6 to 9 11 to 13 7 to 9 Melting point 960 860〇C 890〇C Specific gravity 8. 2 7. 9 8. 0 Electrical impedance 60 60 60 // Ω /cm Thermal expansion number 13 to 15 13 15 β ra/m*°C Hardness (HV) 619 556 594 by 350 〇C,1 1009 1002 1130 hours hardness after heating (HV) stress semi-compression compression compression magnetic micromagnetic non-magnetic non-magnetic close (psi) 50000 to 50000 to 50000 to 70000 70000 70000 pair #性〇◎ ◎ drug resistant 〇 ◎ ◎ uniformity ± 5 % or less ± 5 % or less ± 5 % or less ± 25 ° 15 (β m / hr ) M3 5 7421 No detected lOOppm 650ppm And 'far without key recording layer can be bonded to the VIII element and Its alloy, stainless steel, copper and its alloys, aluminum and its alloys, titanium and its alloys, and magnesium and its alloys are widely used. The second lubricating layer (13) is coated on the surface of the first lubricating layer (12). , thickness 2 to 8 microns (#m), which is a layer of polytetrafluoroethylene alloy, which is a specific content of polytetrafluoroethylene (P〇lytetraflu〇r〇ethylene; PTFE) particles (3 to 32v〇1) %) Disperse eutectoid in an electroless nickel layer containing a volume percentage of 3 to 3 5 vol% of polytetrafluoroethylene (PTFE). The first embodiment uses a poly-reading alloy layer volume percentage: 2 〇 to 35 〇 1% of polytetrafluoroethylene, the density of which is 5.9 to 6.8 g / cm 3 Therefore, the converted weight percentage is 6 to 12.5 wt%, and contains 75 to 1% by weight of phosphorus, Π to 86% by weight of nickel, and subsequent processing can be performed on the second lubricating layer (13). On the money - the nitride layer is used as a strengthening layer or processed with baking varnish. Gold layer physical I biomass comparison ^ low content polytetrafluoroethylene ^ ^ λ, the table is an electroless nickel layer with different ratio of polytetrafluoroethylene low content polytetrafluoroethylene alloy layer mountain a 焉 content polytetrafluoroethylene Alloy layer _------ electroless nickel layer nickel (wt%) 83 to 86 77 to 83 —---- 88 to 92 phosphorus (wt%) 7. 5 to 9 ------ _8j; 1〇— 8至12 M357421 PTFE (wt%) 6 to 8.5 (20 to 25 vol %) 9· 5 to 12. 5 (29 to 35 vol %) 0 PTFE 0. 2 to 0 4 0. 2 to 0·4 No particle size (β m) Density 6. 4 to 6. 8 5. 9 to 6. 3 7. 9 g/cm3 Hardness heat 250 to 350 200 to 300 500 to 550 ( HV) Preheating heat 400 to 500 350 to 450 550 to 900. Table 3 shows the friction coefficient of the PTFE layer and the conventional low friction coefficient material: Static friction coefficient Dynamic friction coefficient PTFE. 0.097 gold layer electroless nickel 0. 191 0. 144 cold rolled stainless steel plate 0. 507 0. 427 (SPCC) copper 0. 232 0.146 aluminum 0.171 0.106 outer chain piece (2), a set of two pieces, oppositely placed inside Chain (1) On the outer side of the M357421, the outer chain piece (2) is provided with a second drag hole (2 i), and the second hole: the contact hole (21) corresponds to the first pivot hole (1) of the inner link piece (1). Please refer to the third figure, the outer chain piece is also provided with a first lubricating layer (22) and a second lubricating layer (23). For the characteristics, please refer to the description of the inner chain piece (1). Narration. The chain roller (3) is annular and has a perforation (31) interposed between each of the inner links (1). Please refer to the fourth figure. The chain roller (3) also has a first lubricating layer (32) and a second lubricating layer (33). For the 罾 characteristics, please refer to the description of the inner chain (1). The chain shaft (4) is inserted through the through hole (31) of the chain roller, and is pivotally connected to the second pivot hole (21) of each adjacent outer chain piece and the first pivot hole of the inner chain piece (1) (11). Please refer to the fifth figure. The chain shaft is also provided with a first lubricating layer (41) and a second lubricating layer (42). For the characteristics, please refer to the description of the inner chain (1). The second embodiment of the present invention is a lubrication structure of a chain. Please refer to the sixth embodiment, which is different from the first embodiment in that the chain assembly of the second embodiment is further provided with a bushing (5). A perforation (51) is disposed between each of the inner chain pieces (1) and is accommodated in the aforementioned chain roller (3) to be rotatable. As shown in the seventh figure, the bushing is also provided. There is a first lubricating layer (52) and a second lubricating layer (53), the characteristics of which are described with reference to the inner chain piece (1) of the first embodiment. In combination, each of the first lubricating layers (12), (22), (32), (41), and (52) of the respective embodiments of the present invention is an electroless nickel layer, which has uniform coating, strong adhesion, and high hardness. , wear resistance, good corrosion resistance, M357421 can be welded, the hardness of the coating is above HV500 degrees (HRC50), if after reprocessing, the hardness of the coating can reach HV1 000 degrees (HRC7〇), which can improve the hardness of the chain structure. Moreover, each of the second lubricating layers '(23), (33), (42), and (53) in the respective embodiments of the present invention is a polytetrafluoroethylene alloy layer having a low friction system| The friction coefficient of PTFE a is lower than that of the conventional low friction coefficient, so the lubrication is good, and the surface is non-sticky, avoiding the adhesion of dirt and making the chain unsmooth. 'The first: lubricating layer It has excellent temperature resistance, electrical insulation, aging resistance, non-combustibility, strong chemical stability and extremely low water absorption. Therefore, this creation can be used for a long time without replacement. It can be automatically lubricated and added to the chain. The surface hardness, the service life of the chain, and the lubrication structure of the chain that does not affect its tensile strength. [Simple description of the drawings] • Figure-four (4) This is a set of chain components in the first embodiment. The first figure is a cross-sectional view of the inner chain piece structure in the first embodiment of the present invention. Fig. 0 is a view showing the structure of the outer chain piece in the first embodiment of the present invention. The fourth figure is a cross-sectional view of the chain structure in the first embodiment of the creation. The fifth drawing is a cross-sectional view of the key shaft structure in the first embodiment of the creation. The sixth drawing is a cross-sectional view of the chain of the second embodiment of the present creation. 11 M3 5 7421 The seventh drawing is a cross-sectional view of the bushing construction in the second embodiment of the present invention. The eighth figure is a schematic diagram of the conventional chain structure. [Main component symbol description] (1) Inner link piece (11) First pivot hole (12) First lubrication layer (13) Second lubrication layer (2) Outer link piece (21) Second arm joint hole (22 ) First lubricating layer (23) Second lubricating layer (3) Chain roller (31) Perforation (32) First lubricating layer (33) Second lubricating layer (4) Chain shaft (41) First lubricating layer (42) Second lubricating layer (5) Bushing (51) Perforation (52) First lubricating layer (53) Second lubricating layer (A) Key piece (A1) Inner flange (B) Chain roller (C) Chain shaft 12