吉林大學本科畢業論文汽車發動機正時鏈系統的設計方法和性能試驗近年來，隨著鏈傳動技術的不斷發展，汽車發動機越來越多的采用了正時鏈、機油泵鏈、平衡軸鏈、共軌泵鏈等。由于汽車鏈的高速多沖、大載荷以及速度與載荷的交變特性，其承載的功率與速度已遠遠超過普通工業鏈條的承載能力,并且其工作點及性能指標已跨越了常規意義下鏈傳動技術領域,失效機理及設計理論也發生了根本變化，從而形成了學科的前沿研究領域和行業內亟待解決的關鍵技術。由于發達國家的技術壁 的 ，不 車形成 的 設計與 技術，而且汽車 的關鍵 技術也大多 。前國內 發動機鏈傳動的設計方法，國內 多發動機 業的正時傳動系統 國設計，正時鏈條也大多 于。，研究發動機正時傳動系統的設計方法及其失效機理，currency1 的 技術 “意義。汽車發動機正時傳動系統的設計方法與性能試驗，fi國家科技 fl 業技術 ” 高 度汽車發動機用鏈研究 的“成 。論文fl汽車發動機正時鏈設計 內， 國內 發動機生 業fl了 用，發動機正時鏈失效fl的 研究成也 業 生 fl 了指 作用，汽車鏈 了 大的 高。 鏈傳動 動學了 鏈傳動 動過 fl，從動 速度 與鏈 不 、不 、不 下的 特性，并計了 特 下的速度不 系Kl ，并通過與計 了鏈傳動 特 傳動下，并不fi 于正 線 X軸上 線形 。 fl 較短的下，不 鏈 、不 的鏈傳動， 齒交替 瞬間，速度不 系線會現尖點、非對稱的波動及 于三波形等傳遞特性；了不 時，速度不 系 線的變化趨勢；以及較長fl 時，張緊裝置的支撐點 置 盡可能的將鏈傳動設計成 傳動。本文的與研究步豐富了鏈傳動的1吉林大學本科畢業論文理論內， 時也發動機正時鏈系統設計 供了理論支撐與思路。二 汽車發動機正時鏈系統的設計方法了汽車鏈的服役條 及其 失效形式，闡述了汽車鏈的選擇與計方法， 了汽車鏈圓弧垂度和鏈長的解表達式，研究了張緊器工作行 以及張緊器 板、阻尼器 率半徑和長度的設計準則， 了汽車發動機正時鏈系統的設計方法。試驗研究表明，這設計的計方法，對于 研發汽車發動機正時鏈系統 “意義。發動機鏈傳動fl的鏈長設計，不 于常規的求解fl 和鏈條垂度的方法。 傳統方法不能 成汽車傳動鏈設計的下，本文采用解法、非線性方 確 坐標法、CAD輔助等方法來確鏈長，研究了鏈長、張緊器與阻尼器 板 率半徑、張緊器工作行 等參的設計方法，并給了段圓弧或三段圓弧張緊器 板的設計思路與方法。這方法的currency1，將改變我國正時鏈系統國設計的被動局面。三 汽車發動機正時鏈傳動試驗與失效試驗 用的發動機國 49Q雙軸正時鏈傳動汽油發動機，車道路試驗行駛萬公 ，鏈條伸長率.94%，行駛 國轎車行駛 的5%左右。試驗 了正時鏈失效機理，并側“了滾子、套筒、銷軸之間的磨損方式， 高鏈條 供了 據。試驗“點了汽車鏈的 滾子失效的 原:多沖特性、夾雜、冷擠劃痕與臺階、變形與過熱等，并 針對性 切可行的改currency1議。試驗表明:試驗前后的內鏈節松動扭矩明顯下降。試驗fl的正時鏈條滾子現破碎、深度裂紋、微裂紋等不 度的磨損和不 形式的損壞。滾子 受交變多沖的交變載荷作用下而 生了 性變形，滾子的高度 。這特 與普通工業鏈條的滾子fi不 的，而currency1議， 設計與 過 fl， 的內鏈節與滾子之間的間 。 下可以 滾子斷 臺階 力 及 裂紋；滾子 表 fl的夾雜fi滾子現裂紋的 原，滾子 工過 fl 的臺階則fi滾子2吉林大學本科畢業論文斷裂的根 。 高滾子的 工 fi 高鏈條 的關鍵。汽車發動機正時鏈的微動磨損由于汽車鏈的高速以及交變速度的多沖性， 銷軸與鏈板、套筒與內鏈板 以過 方式 的 的 表面生了 性變形， 了銷軸與鏈板 、套筒與內鏈板 fl間的 度降， 度降 度時， 表面currency1松動并“ 汽車鏈失效。試驗前后內鏈節松動扭矩fi 下降。試驗fl發現fl 間 的fl鏈板與銷軸之間的工作 面現了 的 紋，而 銷軸 與 鏈板過 的 面不 這現。這 表面的形成，fi ，并且 垂”交變載荷與表面切 力的 力作用下 的，“形成了 面的變形。通常的微動磨損fi著、裂破壞，本文 了 的下，并不 會現表面的破壞， 不 下 現的表面 的變形與 ，表現破壞方式 不 。前微動學的研究 方 ，其以發達國家的發展較 ，表高科技的微動學被越來越多的 “。用子動力學 研究 的 變和面 現、 與 形成與 的研究，以及 微 的學研究越來越多，機 fl 的破壞方式fi 前熱 研究的。于上述理論 ，了汽車發動機正時鏈傳動系統 工作fl的微動磨損特 與驗 fl的試驗之間的不 特點，并以子動力學方法 研究并 磨損過 fl由于 度 、力作用下現的扭矩 生的微動、 面 等多 學fl的 ， 的子 與 的變化，“形成了鏈板與銷軸的 變形。研究發現， 變形 發動機正時傳動系統fl不fi 的失效 ，給本研究方 了 的微動學方 的研究。Hy-Vo齒形鏈磨損特性的研究通過計以及300 時的臺磨損試驗，研究了3吉林大學本科畢業論文Hy-Vo齒形鏈的磨特性，表明，由于Hy-Vo齒形鏈的對對滾 銷軸以滾動 交替承載磨損，其承載表面 較普通滾子鏈以及圓銷式齒形鏈，Hy-Vo齒形鏈 較高的磨性。對Hy-Vo齒形鏈的 銷軸、內- 鏈板以及 鏈板的磨損表面 了SEM形 。銷軸的磨損機 磨損，工作鏈板的磨損機 磨 磨損和 磨損。Hy-Vo齒形鏈臺試驗fl，發現了其特 的傳動現， 鏈 速 后，Hy-Vo齒形鏈的松現了特 的上 現，這fi 鏈 速下套筒滾子鏈和圓銷式齒形鏈傳動試驗fl 現過的特 現，現的現與Hy-Vo齒形鏈傳動fl的上 關，也與 力 關， 力不fi 成現的 原。由于Hy-Vo齒形鏈的松上 的特 現，而，松 上、緊 下的Hy-Vo齒形鏈 可以 傳動工的 求，不會發生由于鏈條磨損伸長而 松 上的鏈條與鏈 齒的 涉現，從而和證了這Hy-Vo齒形鏈 廣泛的適用性。Hy-Vo齒形鏈鏈 公法線長度的設計計方法Hy-Vo齒形鏈鏈 公法線長度fi 其傳動性能的“精度指標。 了Hy-Vo齒形鏈鏈節圍 鏈 齒上 時其節 和 對公法線長度 的 上，根據Hy-Vo齒形鏈與鏈 的正確 條 ，通過參變化，currency1了Hy-Vo齒形鏈鏈 滾刀三者之間的 設計 系， 了既可適用于鏈板齒形等于鏈 力，也可適用于鏈板齒形不等于鏈 力的Hy-Vo齒形鏈鏈 公法線長度的設計計方法，試驗研究表明，這的設計計方法fi科學的，切可行的。 時，指了大負變 、短齒、齒頂倒大圓的Hy-Vo齒形鏈鏈 公法線長度、跨測齒的計與修正方法。汽車鏈 壽命威布爾布形 參的探討探討了汽車鏈 壽命的布規律， 了汽車鏈 壽命威布爾布形 參隨鏈條規、載荷水平變化的特點，設計了可壽命的抽檢驗方法，從而汽車鏈 可性設計和驗證供了“ 據。4吉林大學本科畢業論文時鏈測試用綜述其fl“關鍵的 汽油發動機 ，可以幫助減少 害污染物和 持適的燃燒fi 精確 步閥列車。時間鏈連 軸與 或多 軸必須 持 廣泛的速度， 速度，以及適的 度非常精確的 ，以確 閥 排氣費用。現時機鏈擁 卓越的成績和它fi“好的 材料和能工藝 供高可性和噪音。堅持 每的汽車發動機，的 驅動系統必須不斷跟蹤，控 和記錄。 用 度，伸長率磨性，彈性延伸，和 性變形來評價。作 系統，驅動器行測試的負載， 度， 力，并動議。US Tsubaki, Inc., Chicopee, Mass.fi 突的公司 汽車發動機 商專 設計和生 優 時間鏈 驅動系統。引擎范圍從1.55.5升 網上和五缸的置，每 獨特的 驅動系統。原設備 商求鏈鏈 系統fi非常可，安靜，和 持的時間精度“高可能超過生命的 。 于US Tsubakis專業 和客戶 意度 供“好的 驅動系統的引擎。了確 這點的 ，US Tsubaki擁 的現檢測設備用于的驗證和壽命測試時間鏈 驅動系統。無論fi 的驗 和客戶的網站，工 師 可性試驗記錄時據長時間。潛 的解決方案設備 次委托 十多年前，據采集系統fl的測試驗 成的字 波器和字音頻磁帶。這設備 于少幾 投 和可選的收購率，以及大 的據， 可以 理商店遠遠于 的面的壽命測試。糟糕的fi，軟 供了這設備 的據 交給 特 的 子表式，幾乎 的力充據。IOtech的解決方案“近，尼爾凱西 工 驗 管，評估幾 據采集系5吉林大學本科畢業論文統，其 的fi改和驗 的能力，獲取，儲和關鍵時序鏈 驅動系統的性能。“近，尼爾凱西 工 驗 管，評估幾 據采集系統，其 的fi改和驗 的能力，獲取，儲和關鍵時序鏈 驅動系統的性能。， 購買了IOtech WaveBook 。凱西的 currency1發和測試，以 的性能標準， 它現 能 跟上不斷變化的 求， 通常下， 的引擎 準備好符 鏈 軸驅動系統，測試儀器，凱西站 器，本上仿發動機 驅動器。試驗臺包含鏈 ，指南，和張緊， 于正fi 將 這 特 的引擎。 動機的速，通過系統 的速度范圍內，將 行 的車輛。凱西說， 長的 性試驗，我 用WaveBook測 ，記錄和 據計機的 驅動器fl。 ，我可以根據 關據行時。 前，凱西 用16 通道， WBK16 8 變計， WBK40 14熱 ，和 以 網 。 了 道的 性， ， 被 能力選擇 采集速度。凱西說隨著 波器，我 的 置采集速率。這意 著 獲大 不必的據或不獲取 的據來準確 評價 系統。根據采集速度 本 行fi通常的2.5 ，這我 不會現失 的 ，軟 可以 我將它說。Wave Book記錄的議案， 力，力， 變， 度和 動。 間 傳 器測 動 緊的 。 力傳 器測 油 張緊和 點的引擎。 負載 的 緊發的支點。這我 供了 估計的負荷 行鏈，這fi關鍵的壽命 測系統， 凱西說fl我不過的 驅動系統，currency1破它或減少其 用壽命。我 的設計規范，以 其 “壽命和WaveBook確我不會超了 。變計適用于 的支點指南和指 的 力。熱 測 油 過 fl 油路和發動機，特fifi近的 張緊。從理論上來說，時間鏈 軸驅動系統包 性的 度其fl方fi 緊張而其 已fi。這非常 的flfi可能引時間變化之間的 軸和 軸或由 來 。 學軸器置 軸和 軸每扭 和由 生的時間的變化關系。6吉林大學本科畢業論文我 WaveBook的 性，凱西說和其 ，緊的物理 。我 選擇 獲頻率，以及 速，我可以設置它，并currency1”據。 ，它非常學和 用。 我fi 可以 客戶的網站。凱西說， DASYLab 軟 fi優的 ，后 理，currency1表和，并 生 意布局 上，工 師可以 用它來currency1 測試序列。并 用戶不技術精明的 商。 的形面，用戶面，能 線 道 序和規fi。對于我客戶特fi“的fi文 的式。我與多汽車 商和工 的工作 不 的文 式。與WaveView ，我 選擇 通常 用的文 式。論US Tsubakifi設計和生 優 時間鏈 驅動系統的幾 的汽車 商。了確 高 ，專家行的 性和壽命試驗的現 測試驗 用IOtech WaveBook和理用于測 力， 度，和多其 變。7吉林大學本科畢業論文附錄：吉林大學本科畢業設計翻譯源文件The Design Method and Performance Experiments of Automobile Engine Timing Chain System As the development of the chains product and technology, the auto engine is adopting timing chain , lubricating oil pump chain, trunnion shaft chain and share rail chain , and so on. Since the auto chain has high speed, serious impact, excessive load and the alternate characteristic of velocity and load, the timing chain must burden exceed more power and velocity and need more capacity compare with common industrial chain. The working point and performance index have transcended the conventional chain transmission condition. Now the automobile industry of our country is developing rapidly. But we should do some self-reflection as a result of we dont know the technical of auto engine chain design method. Not only the integrity design and manufacture technical of independent property right about whole auto have not formed but also the key technicals of the parts on auto are mastered by foreign companies mostly. At present, the technology of chain transmission design on engine have not been mastered and many domestic engine enterprises depend on foreign design and most of the timing chains depend on import. Now the methods of design automobile timing chain havent been mastered. Many engine company automobile timing chains depend on other abroad company. Now many automobile timing chain products depend on import. It is important to study the design method of the transmission system of timing chain and the mechanism of invalidation and own the key technology with independent property right. The Design Method 8吉林大學本科畢業論文of Automobile Engine Timing Chain System and Its Ability Experiments is our Science and Technology ministry “Small and middle company technology study fund project”(01C26213300872) and it is the important parts of the “High strength automobile engine chain” and many important result have been used in many company.1 The kinematics analysis of chain transmissionIn this paper, we analyzed the meshing characteristic in the process of chain transmission. And we analyzed it in different angle and distance and dimensional structure respectively. Analyzing and calculating the nonhomogeneous angle velocity coefficient (Kl) in special statement. Through analysis and calculating, we also draw the angle velocity fluctuate picture in special state, which is not always similar with the part on X axis of sinusoid. When the distance between centers are short relatively, the curve of the nonhomogeneous angle velocity coefficient (Kl) will has a fastigium and unsymmetrical fluctuation and something like triangle wave in different sprocket and different phase in the instant of alternate meshing. We also analysis variety trend of the nonhomogeneous angle velocity coefficient(Kl) in different apart and when the distance between centre is long relatively the position of support point on tension equipment should keep the same phase. These study result and analysis more enrichment the chain transmission and provide theory for the automobile timing chain design method at the same time.2 The design method of timing chain system of auto engineWe analyzed the service condition and main format of invalidation of the auto chain and explain the method of selection and calculation of auto chain and educe the expression of the length in vertical direction and the length of auto chain. We have studied the design method of vibration damper strips and guide line of tensioner equipment and the curvature of the chain tensioner board and guide board. Put forward the design method of auto timing chain system. The test shows that the design methods play an important role in the process of studying the auto timing chain system independently.9吉林大學本科畢業論文It is different with general chain to solve the central distance and the length in vertical direction for the auto chain transmission. In the paper we adopt mathematics method of coordinate confirmed by equation and with the assistant of CAD to solve the length of chain. We also modify the length of chain in the process of design. With upward method, we can finish the design method of the length of chain and tension equipment and the curvature of guide board、the work process of tension equipment and so on at last. Then we put forward the design method of the board of tensioner equipment with two or three part of round arc and this method will be end the automobile engine timing chain need design by abroad company. 3. The transmission experimentation and invalidation analysis on the timing chain of auto engineThe experimentation was used 491Q engine with timing chain transmission made in domestic .And the experiment run 110000 Km and the protract ratio is 0.94% just only the half distance with others countrys car.After experimentation, the reason of timing chain invalidation was analyzed in detail and the emphasize particularly on wear manner among the roller、bushing and pin was also analyzed. It offers the gist for the elevation of chains quality. Quite a few breakage reasons about the roller, which were analyzed in the experiment are many impact characteristics lard hard-press nicks and steps distortion pass hot and so on. The out and inner chains become flexible because the toration descends.Lax torque of front, back, inside and outside chain descend after experiment； silent chain rollers appear fragmentation, depth crack, tiny crack etc. of different degree wear and different form damnification and plastic distortion of rollers under alternant changing load at work makes rollers height increase. We can see stress layer and track on end step of roller broken district by SEM scan electric microscope. The main reason of rollers track is lard in rollers flimsy layer, and the origin of rollers rupture is rollers step. So, the key of improve chain quality is improving rollers manufacture method and reduce the faults in the surface of the roller.4. Automotive Engine Time Chain Systems Fretting 10吉林大學本科畢業論文wearBecause of the automotive chains high velocity, changeable speeds repetitious concussion, the copulated surfaces of the two interfered parts which are connected by the pin and the outer link plate hole, the sleeve and the inner link plate hole, tiny abrasion occur on the pins. Followed by the tiny abrasions strengthen gradually, the intensity between the pin and outer link plate hole, sleeve and inner link plate hole decreased. When it reachs on some degree, the two copulated surfaces begin to become flexible and which would resulted in the automotive chains invalidation.In the process of the automotive engine time chain systems invalid mechanisms analyzing and the microcosmic shapes SEM analyzing of the experiments time chain, I found that there is fine wrinkle on the working combinative surfaces of the middle link between the plate and the pin, while there is no such phenomenon on the combinative surface between the same pine and the two outer link plates. Under nanometer conditions, It is because of the resultant force of the vertical and changeable load and the surface tangential force that make such things occurred. Different with the touched in small-scale, The phenomenon occured in this experiment of the tiny abrasion is another typical earlier character of the nanotribology area, and which make the damage system of the nanotribology moved up one step. The common tiny abrasion is damaged by adhering and lacerating. In this thesis, I considered that in less displacement conditions it is not always appears the surfaces damage, the crystal lattices deformation and displacement always occurs firstly in different conditions. At present, the study of tribology is in the ascendant all over the world, especially in the developed countries. As the commissary of high-tech, tribology has been paid great attention. Using the Member dynamics model, The productions of nanotribology based on the phasic change of the solid liquid forms and the slippage phenomenon of the interface in nanometer lever, the displacement made by the solid crystal lattice and crystal interface, and study of the displacement swing in micron class in nanotribology appears more and more in authoritative publications all over the world. Using the Member dynamics model, the research in opening out the interaction and the 11吉林大學本科畢業論文rules of the factors, such as the temperature, friction and touching area etc, analyze the unusual destructive methods in the mechanism has become a pop research subject. This experiment is based on the foundation above-mentioned. It analyzed the character of the nano-jiggle abrasion in the automotive engine time chain transmission systems practical work and the difference between the Fritting wear practical work and the experiment in the lab. The Fritting wear between the middle link plate and the pin can be considered as the multiple movement between the radial jiggle and the tangential jiggle, Also it can be defined as the combination between the radial jiggle and rotational jiggle on the whole. This is the typical combinatorial pattern of the jiggle abrasion. In the experiment, the jiggle appears in the lubrication surface in nanometer level.It may shape the tiny nick on the surface in the process of the link plates pressing. It is exactly these tiny nicks gradual changes produced the jiggle distortion, then the surfaces heave and hollow large, which resulted the coupling distortions formation between the link plate and the pin in the end. This coupling distortion isnt the main invalid factor of the engine transmission system, however, it brings a new investigative in the field of the fretting wear.5. Assistant parts Ability Experiments in the timing chain system We has analysis the elongate rate of the wear lead to the change of the mesh position of the automobile and influence the camshaft lag angle. And we did the experiments of different material of the vibration damper strip and tensioner frictions； analysis the influence on the automobile engine take into air and exhaust and working ability with camshaft lag angle.In the recent years, research on transmission system design method of automobile engines silent chain is developed associated with corporation technique center； we synthetize by the numbers theory and technique of many subjects mechanics , mathematics , dynamics, tribology, material science, numeric design method, micro computer analysis technique, TCA technique, emulational technique, CAD, CAGD and so on , and get a series of important research result possessed independent knowledge able property right ； and we 12吉林大學本科畢業論文respectively get certificate of segmental automobile mainframe and engine factory such as the First Automobile Manufacture Factory, Shanghai Automobile Manufacture Factory, Shenglong, Qinouji, Changan Fute, Nanjing Yiweike, Anhui Qirui, Guangxi yuchai, Haerbin Dongan and so on； achieve anticipation that the automobile chain made in china； bring important economic and social benefit； offer wide research space that many subjects intersect； engender new technique innovation of industrial and research & development system with making,studying,researching； have not only theory meaning but also higher applied value. The automobile chain system will develop in the direction of high rotate speed, small section distance and individuation, along with the request new-style saloon car engines lightweight, low noise and high reliability. Based on high speed character of automobile chain system and research on invalidation mechanism, this thesis R&D and bring key designing manufacture technique and reliable experimentation method that have independent knowledgeable property right and adapt domestic use, and establish stable base for design theory of high-speed chain transmission. Research on the Wear Characteristics of a New Hy-Vo Silent ChainThe wear resistance characteristic of a new Hy-Vo silent chain has been studied based on the calculation and the experiment on the test bench for 300 hours. The result shows that a pair of heterogeneous pins of the new Hy-Vo silent chain alternatively bear the load with rolling friction, which makes the bearing surface pressure of the special-shape pin is lower than the pressure of roller chain pin and silent chain pin, thus the new Hy-Vo silent chain has excellent wear resistance. The wear surface morphologies of the plate and the special-shape pin were analyzed by SEM. The wear mechanism of the pin is fatigue wear and the wear mechanism of the plate is abrasive wear with fatigue wear.The special phenomenon has been found in the bench test of the New Hy-Vo Silent Chain, that is the slack span raised when the sprocket speed up to certain value. This phenomenon did not appear at the bench test of the roller chain and the round-pin Silnet Chains under the same sprocket speed. This special phenomenon relates to the upswept angle and the centrifugal force of the Hy-Vo Silent Chain. However, the centrifugal force is not the main reason witch caused this 13吉林大學本科畢業論文phenomenon. The arrangement slack span is at upside and the tight span is at the underside of the chain also can meet the transmission requirement because the New Hy-Vo Silent Chains has the slack span raised characteristic, and the interference between the slack span and the sprocket tooth for the wear-elongation were not happen. The New Hy-Vo Silent Chain can be used at broader field than other type chains.The design calculation on common normal line length of Hy-Vo silent chain sprocketThe common normal line length of Hy-Vo silent chain is the important precision index that can affect the performance of transmission. Through transformation of parameters, the meshing design system among Hy-Vo silent chain, sprocket and hob was built up based on the researching of the pitch increment and the equivalent apothem increment of the effects on the common normal line length when the Hy-Vo silent chain was wrapped around and located on the sprocket, with the proper meshing conditions of Hy-Vo silent chain and sprocket into consideration. The design method of common normal line length was put forward that can be used when the value of the sprocket pressure angle is equal or unequal to the value of the Hy-Vo chain plate pressure angle. Experiments show that this new design method is feasible. In addition, the calculation and amendment of common normal line length and the measuring teeth number was investigated for the sprocket with large negative modification coefficient, stub teeth and large fillet radius.Study on Weibull distribution form parameter of automotive chain fatigue lifetimeIn this paper distribution function of automotive chain fatigue lifetime are discussed and characteristics of Weibull distribution form parameter of fatigue lifetime that vary with its specification and loading are analyzed, then sampling inspection plan of lifetime of reliability is designed. This paper provides a sound basis for reliability design and reliability proof of automotive chain fatigue lifetime.Timing Chain TestingApplication SummaryOne of the most critical factors in a gasoline，engine that helps reduce harmful pollutants and maintain proper combustion is a 14吉林大學本科畢業論文precisely synchronized valve train. The timing chain connecting the crankshaft with one or more camshafts must maintain extraordinarily accurate dimensions over a wide range of speeds, accelerations, and temperatures to ensure proper valve positioning for intake and exhaust charges.Modern timing chains have superior finishes and are manufactured with the finest materials and processes available for high reliability and low noise. To uphold that quality for each generation of automobile engine, the components of the cam drive system must be continuously tracked, controlled, and recorded. Components are evaluated for strength, wear elongation, elastic stretch, and plastic deformation. As a system, the cam drive is tested for load, temperature, strain, and motion.US Tsubaki, Inc., Chicopee, Mass., is one prominent company that designs and manufactures premium timing chain cam drive systems for major automobile engine manufacturers. The engines range from 1.5 to 5.5-liter displacement with in-line and V-cylinder configurations, and each requires a unique cam drive system. OEMs demand that the chain sprocket systems be extremely reliable, quiet, and maintain the highest timing accuracy possible over the life of the product. They depend on US Tsubakis expertise and customer satisfaction to provide them with the best cam drive system for their engine.To ensure this quality, US Tsubaki houses a modern testing facility devoted to product validation and life testing timing chain cam drive systems. The engineers record real-time data over long periods during reliability tests, both in their laboratory and at customers sites.Potential SolutionWhen the facility was first commissioned more than a decade ago, data acquisition systems in the test lab comprised digital oscilloscopes and digital-audio tapes. But this equipment is limited to only a few inputs and selectable acquisition rates, and the amount of data they can reasonably store is much less than that required for a comprehensive life test. Whats worse, the software supplied with this equipment limits data presentation to a specific spreadsheet format with hardly enough power to sufficiently analyze the data.IOtechs SolutionRecently, Neil Casey, Product Engineering Laboratory 15吉林大學本科畢業論文supervisor, evaluated several data acquisition systems with the goal of improving and updating the labs capability to acquire, store, and analyze critical timing chain cam drive system performance. He needed to expand the number of input channels and acquire more accurate data that could be easily presented to internal and external customers in different formats. As a result, he purchased an IOtech WaveBook . Casey is now able to keep pace with the changing demands of advanced product development and testing to rigid performance standards.Frequently, when a new engine is not ready to be fit with an advanced chain cam drive system, Casey instruments a test stand simulator that basically mimics the engines cam drive. The test stand contains sprockets, guides, and tensioners, all located exactly where they would be on that specific engine. An electric motor spins the system through the same speed range it would run in an actual vehicle. Says Casey, “During a long durability test, I use the WaveBook to measure, record, and stream data to a computers hard disk drive. Also, I can look at the data in real time.” Currently, Casey uses 16 analog channels, a WBK16 for 8 strain-gages, a WBK40 for 14 thermocouples, and an Ethernet interface. Besides the channel flexibility, he appreciates the ability to select any acquisition speed he desires. “With the oscilloscopes, we had limited selection of preset acquisition rates. That meant capturing enormous amounts of unnecessary data or not capturing enough data to accurately evaluate a system. I typically run 2.5 times the acquisition speed needed, so w