乘用車機械式變速器設(shè)計【兩軸式機械式變速器】【4檔】

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附錄： THE FILE TRANSMISSION GEAR SELECTION OF THE BASIC PARAMETERS 1, Reasonable choice of module: Modulus is an important gear basic parameters, the greater the modulus, the greater the tooth thickness, the bending strength of gear is also greater, and its greater carrying capacity. Instead modulus smaller tooth thickness will be thinner, the bending strength of gear will be smaller. The low profile of the gear, due to the low rotational speed, torque, and gear of the relatively large bending stress, so need to choose a larger module in order to ensure its strength. And high-speed file gear, due to the high-speed, torque small gear bending stress is relatively small, so to ensure that the bending strength of gear under the premise of the general selection of the smaller module, so that gear teeth can be increased in order to obtain larger degree of overlap, so as to achieve the purpose of reducing noise. In a modern gearbox design, the file selection module gear is different. For example, a transmission gear of a file to the five-gear gear module are: 3.5; 3; 2.75; 2.5; 2; to change over the past modulus or modulus of the same can not be the situation of Latin America. 2, a reasonable selection of pressure angle: When a gear module and set the number of teeth, the gear diameter is determined, and the gear tooth involute base circle depends on the size, the size of the base circle and under pressure angle. For the same pitch circle of gear, if its pitch circle a different pressure angle, base circle is different. When the greater the pressure angle, the base circle diameter of the smaller, more curved involute, tooth root of the tooth will thicken, increase the tooth surface radius of curvature, which can increase the tooth bending strength and contact strength. When reducing the pressure angle, the base will become larger diameter, involute tooth profile will change some of the straight, thinning of the tooth root, tooth smaller radius of curvature, making the tooth bending strength and contact intensity will decrease, but decrease with the pressure angle, to increase the contact ratio gears, reducing the stiffness of the tooth, and can reduce the entry and exit load at the time of engagement, all of which are beneficial to reduce noise. There-fore, low profile gear, often larger pressure angle in order to meet the strength requirements; and regular use of high-speed file smaller gear pressure angle in order to meet the requirements of its lower noise. For example: a gear module 3, the number of teeth of 30, when the pressure angle of 17.5 degrees for the circular tooth thickness of the base to 5.341; when the pressure angle of 25 degrees, the tooth thickness of the base circle to 6.716; its base circle to increase the tooth thickness 25%, so increase the pressure angle to increase their flexural strength. 3, A reasonable selection of Helix Angle: Compared with the straight gear, helical gear drive with a smooth, coincidence degree, the impact is small and the advantages of small noise. As a result of the present with synchronous transmission, and transmission will no longer be a direct mobile gear meshing with another gear, but with all the gears are meshing, so that'll bring convenience to the use of helical gear, so to bring the gearbox synchronizer Most of the use of helical gear. Helical gear as a result of the characteristics of the entire tooth width decision not to enter the mesh at the same time all but one end of first gear into the mesh, with the drive gear along the tooth width direction mesh gradually until all the teeth have wide access to mesh, so the actual meshing helical gear spur the region than the large. When the tooth when a certain width, the contact ratio of helical gear with helix angle increases. Carrying capacity is also stronger, have better stability. In theory, the better helix angle, but the helix angle increases, the axial force will also increase, so that reduces the transmission efficiency. In the modern design of the gearbox, in order to ensure smooth gear drive, low noise and less impact, all . Files for°gear should choose a larger helix angle, generally about 30 high-speed gear as a result of the higher speed, for a smooth, low impact, low noise, so the use of small modulus, large helical angle; and low-profile gear module using the larger, smaller helix angle. 4, The perspective of a reasonable modification is selected: With good conditions for the lubrication of the hardened gear is generally believed that the main danger is in the cycle under alternating stress, the fatigue crack Dedendum gradual expansion of the tooth root fracture caused by the failure. Failure in the gear transmission is a part of this. In order to avoid a broken tooth, should be to maximize the tooth root bending strength, and the use is changed, and can achieve this objective. Under normal circumstances, the greater the coefficient, the smaller values tooth, tooth bending stress on the smaller, the higher the bending strength of teeth. In the hardened gear, the tooth surface pitting failure is one of the reasons off. Increased engagement angle, can reduce the inter-tooth contact stress and maximum slip rates, can greatly increase the ability of anti-pitting. And increased engagement angle, it must have a gear shift is introduced, thereby enhancing contact strength of tooth surface can improve the flexural strength of tooth roots, so as to enhance the effect of the carrying capacity of gears. However, for helical gear drive, variable coefficient is too large, and will total tooth length of the contact line, but to reduce its carrying capacity. At the same time, the greater the coefficient, as a result of tooth to tip increases, the thickness of the tip will be smaller, which will affect the strength of the top teeth. Therefore, in the design of a modern gearbox, the majority of all reasonable use of gear shift is the angle in order to maximize its advantages. Mainly in the following design criteria: low profile for the gear pair, the driving gear of the coefficient should be larger than the passive gear shift coefficient, and pair of high-speed profile, the driving gear of the coefficient should be less than passive coefficient gear. gear with the modification coefficient increased gradually stalls xiajiang. This is because low-grade zones as a result of low rotational speed, torque, and gear for high intensity, so the need to use more of the modification coefficient da. The total of the gear profile shift coefficient is positive (of the anglel shift as amended), and increased with the stalls and gradually decreased. The smaller the total coefficient, a pair of pair of tooth root of the thickness of the total will be thin, tooth root becomes weak, the lower the bending strength, but decreased as a result of the stiffness of the tooth, easy to absorb shock and vibration, so can reduce the noise. And tooth contact ratio will increase, which bear a single tooth at the time of maximum load Dedendum recent focus distance, the reduced bending moment, which is equivalent to increase the strength of the tooth root, which as a result of thinning and weakened tooth root strength offset factor. Therefore, the greater the overall coefficient, the higher the strength of the tooth root, but the noise may increase. Thus high-speed gear to choose a smaller file of the total coefficient, and low-profile gear must be chosen larger coefficient 5, to improve tip high coefficient: Top gear in the transmission of high quality factor, the impact of focusing on adaptation, in the main impact of helical gear contact ratio face. Coincidence degree by the end of the formula, we can see that when the number of teeth and meshing certain angle, the tooth tip is affected by tooth pressure angle coefficient of the top high impact factor the greater the high-tip, round tip the greater the pressure angle, contact ratio is The greater and ore stable drive. However, the high coefficient the greater the tip, the thickness of the top teth will become thin, thus affecting the strength tip. At the same time, at least not from the tooth root formula, the high coefficient the greater the tip, at least not the root will increase the number of gear, otherwise, they would have a root cutting. As a result, guarantees of non-root tip-cut and sufficient strength, increased tooth top high coefficient of coincidence degree for the increase is significant. Top gear in the transmission of high quality factor, the impact of focusing on adaptation, in the main impact of helical gear contact ratio face. Coincidence degree by the end of the formula, we can see that when the number of teeth and meshing certain angle, the tooth tip is affected by tooth pressure angle coefficient of the top high impact factor the greater the high-tip, round tip the greater the pressure angle, contact ratio is The greater and more stable drive. However, the high coefficient the greater the tip, the thickness of the top teeth will become thin, thus affecting the strength tip. At the same time, at least not from the tooth root formula, the high coefficient the greater the tip, at least not the root will increase the number of gear, otherwise, they would have a root cutting. As a result, guarantees of non-root tip-cut and sufficient strength, increased tooth top high coeff-icient of coincidence degree for the increase is significant. The above is from the module, pressure angle, helix angle, coefficient and a high coefficient of this addendum to an independent analysis of the five aspects of gear design trends. In fact between the various para-meters are inter-related, involved with each other, the choice of transmission parameters, it is necessary to take into account their strengths and weaknesses, but also consider the relationship between them, so in order to maximize their strengths and avoid weaknesses to improve transmission performance. 變速箱各檔齒輪基本參數(shù)的選擇 1、合理選用模數(shù) 模數(shù)是齒輪的一個重要基本參數(shù)，模數(shù)越大，齒厚也就越大，齒輪的彎曲強度也越大，它的承載能力也就越大。反之模數(shù)越小，齒厚就會變薄，齒輪的彎曲強度也就越小。對于低速檔的齒輪，由于轉(zhuǎn)速低、扭矩大，齒輪的彎曲應(yīng)力比較大，所以需選用較大的模數(shù)，以保證其強度要求。而高速檔齒輪，由于轉(zhuǎn)速高、扭矩小，齒輪的彎曲應(yīng)力比較小，所以在保證齒輪彎曲強度的前提下，一般選用較小的模數(shù)，這樣就可以增加齒輪的齒數(shù)，以得到較大的重合度，從而達到降低噪聲的目的。 在現(xiàn)代變速箱設(shè)計中，各檔齒輪模數(shù)的選擇是不同的。例如，某變速箱一檔齒輪到五檔齒輪的模數(shù)分別是：3.5；3；2.75；2.5；2；從而改變了過去模數(shù)相同或模數(shù)拉不開的狀況。 2、合理選用壓力角 當一個齒輪的模數(shù)和齒數(shù)確定了，齒輪的分度圓直徑也就確定了，而齒輪的漸開線齒形取決于基圓的大小，基圓大小又受到壓力角的影響。對于同一分度圓的齒輪而言，若其分度圓壓力角不同，基圓也就不同。當壓力角越大時，基圓直徑就越小，漸開線就越彎曲，輪齒的齒根就會變厚，齒面曲率半徑增大，從而可以提高輪齒的彎曲強度和接觸強度。當減小壓力角時，基圓直徑就會變大，齒形漸開線就會變的平直一些，齒根變薄，齒面的曲率半徑變小，從而使得輪齒的彎曲強度和接觸強度均會下降，但是隨著壓力角的減小，可增加齒輪的重合度，減小輪齒的剛度，并且可以減小進入和退出嚙合時的動載荷，所有這些都有利于降低噪聲。因此，對于低速檔齒輪，常采用較大的壓力角，以滿足其強度要求；而高速檔齒輪常采用較小的壓力角，以滿足其降低噪聲的要求。 例如：某一齒輪模數(shù)為3，齒數(shù)為30，當壓力角為17.5度時基圓齒厚為5.341；當壓力角為25度時，基圓齒厚為6.716；其基圓齒厚增加了25%左右，所以增大壓力角可以增加其彎曲強度。 3、合理選用螺旋角 與直齒輪相比，斜齒輪具有傳動平穩(wěn)，重合度大，沖擊小和噪聲小等優(yōu)點。現(xiàn)在的變速箱由于帶同步器，換檔時不再直接移動一個齒輪與另一個齒輪嚙合，而是所有的齒輪都相嚙合，這樣就給使用斜齒輪帶來方便，因此帶同步器的變速箱大多都使用斜齒輪。 由于斜齒輪的特點，決定了整個齒寬不是同時全部進入嚙合的，而是先由輪齒的一端進入嚙合，隨著輪齒的傳動，沿齒寬方向逐漸進入嚙合，直到全部齒寬都進入嚙合，所以斜齒輪的實際嚙合區(qū)域比直齒輪的大。當齒寬一定時，斜齒輪的重合度隨螺旋角增加而增加。承載能力也就越強，平穩(wěn)性也就越好。從理論上講，螺旋角越大越好，但螺旋角增大，會使軸向分力也增大，從而使得傳遞效率降低了。 在現(xiàn)代變速箱的設(shè)計中，為了保證齒輪傳動的平穩(wěn)性、低噪聲和少沖擊，所有齒輪都要選擇較大的螺旋角，一般都在30°左右。對于高速檔齒輪由于轉(zhuǎn)速較高，要求平穩(wěn)，少沖擊，低噪聲，因此采用小模數(shù)，大螺旋角；而低速檔齒輪則用較大模數(shù)，較小螺旋角。 4、合理選用正角度變位 對于具有良好潤滑條件的硬齒面齒輪傳動，一般認為其主要危險是在循環(huán)交變應(yīng)力作用下，齒根的疲勞裂紋逐漸擴張造成齒根斷裂而失效。變速箱中齒輪失效正是屬于這一種。為了避免輪齒折斷，應(yīng)盡量提高齒根彎曲強度，而運用正變位，則可達到這個目的。一般情況下，變位系數(shù)越大，齒形系數(shù)值就越小，輪齒上彎曲應(yīng)力越小，輪齒彎曲強度就越高。 在硬齒面的齒輪傳動中，齒面點蝕剝落也是失效原因之一。增大嚙合角，可降低齒面間的接觸應(yīng)力和最大滑動率，能大大提高抗點蝕能力。而增大嚙合角，則必須對一副齒輪都實行正變位，這樣既可提高齒面的接觸強度，又可提高齒根的彎曲強度，從而達到提高齒輪的承載能力效果。但是，對于斜齒輪傳動，變位系數(shù)過大，又會使輪齒總的接觸線長度縮短，反而降低其承載能力。同時，變位系數(shù)越大，由于齒頂圓要隨之增大，其齒頂厚度將會變小，這會影響齒頂?shù)膹姸取? 因此在現(xiàn)代變速箱的設(shè)計中，大多數(shù)齒輪均合理采用正角度變位，以最大限度發(fā)揮其優(yōu)點。主要有以下幾個設(shè)計準則： l 對于低速檔齒輪副來說，主動齒輪的變位系數(shù)應(yīng)大于被動齒輪的變位系數(shù)，而對高速檔齒輪副，其主動齒輪的變位系數(shù)應(yīng)小于被動齒輪的變位系數(shù)。 l 主動齒輪的變位系數(shù)隨檔位的升高而逐漸下降。這是因為低檔區(qū)由于轉(zhuǎn)速低、扭矩大，齒輪強度要求高，因此需采用較da的變位系數(shù)。 l 各檔齒輪的總變位系數(shù)都是正的（屬于角變位修正），而且隨著檔位的升高而逐漸減小。總變位系數(shù)越小，一對齒輪副的齒根總的厚度就越薄，齒根就越弱，其抗彎強度就越 低，但是由于輪齒的剛度減小，易于吸收沖擊振動，故可降低噪聲。而且齒形重合度會增加，這使得單齒承受最大載荷時的著力點距齒根近，使得彎曲力矩減小，相當于提高了齒根強度，這對由于齒根減薄而消弱強度的因素有所抵消。所以總變位系數(shù)越大，則齒根強度越高，但噪聲則有可能增大。因此高速檔齒輪要選擇較小的總變位系數(shù)，而低速檔齒輪則必須選用較大的總變位系數(shù)。 5、提高齒頂高系數(shù) 齒頂高系數(shù)在傳動質(zhì)量指標中，影響著重合度，在斜齒輪中主要影響端面重合度。由端面重合度的公式可知，當齒數(shù)和嚙合角一定時，齒頂圓壓力角是受齒頂高系數(shù)影響的，齒頂高系數(shù)越大，齒頂圓壓力角也越大，重合度也就越大，傳動也就越平穩(wěn)。但是，齒頂高系數(shù)越大，齒頂厚度就會越薄，從而影響齒頂強度。同時，從最少不根切齒數(shù)公式來看，齒頂高系數(shù)越大，最少不根切齒數(shù)就會增加，否則的話，就會產(chǎn)生根切。因此，在保證不根切和齒頂強度足夠的情況下，增大齒頂高系數(shù)，對于增加重合度是有意義的。 因此在現(xiàn)代變速箱的設(shè)計中，各檔齒輪的齒頂高系數(shù)都選擇較大的值，一般都大于1.0，稱為細高齒，這對降低噪聲，增加傳動平穩(wěn)性都有明顯的效果。對于低速檔齒輪，為了保證其具有足夠的齒根彎曲強度，一般選用較小的齒頂高系數(shù)；而高速檔齒輪，為了保證其傳動的平穩(wěn)性和低噪聲，一般選用較大的齒頂高系數(shù)。 以上是從模數(shù)、壓力角、螺旋角、變位系數(shù)和齒頂高系數(shù)這五個方面去獨立分析齒輪設(shè)計趨勢。實際上各個參數(shù)之間是互相影響、互相牽連的，在選擇變速箱的參數(shù)時，既要考慮它們的優(yōu)缺點，又要考慮它們之間的相互關(guān)系，從而以最大限度發(fā)揮其長處，避免短處，改善變速箱的使用性能。 SY-025-BY-5 畢業(yè)設(shè)計（論文）中期檢查表 填表日期 2011年4月15日 迄今已進行 7 周剩余 9 周 學生姓名 譚鴻亮 系部 汽車與交通工程學院 專業(yè)、班級 車輛07-10班 指導教師姓名 趙晨光 職稱 講師 從事 專業(yè) 車輛工程 是否外聘 □是□否 題目名稱 學 生 填 寫 畢業(yè)設(shè)計（論文）工作進度 已完成主要內(nèi)容 待完成主要內(nèi)容 　已認真按照要求完成開題報告并且答辯，答辯通過后，自行通過計算選擇設(shè)計數(shù)據(jù)，并按要求，一步一步計算相關(guān)數(shù)據(jù)，并在撰寫說明書?，F(xiàn)在已將齒輪的相關(guān)數(shù)據(jù)算完，且校核，軸與同步器設(shè)計完成一部分，在學習CAD軟件. 一周之內(nèi)將所有數(shù)據(jù)都要算完，并且完成說明書。 認真學習CAD制圖軟件，然后畫圖。 最后將完成的東西與導師一起探討，有錯誤的地方認真修改，最后準備正式答辯！ 存在問題及努力方向 　一些與設(shè)計相關(guān)的知識不是很熟悉，CAD軟件不是太精通。在一段時間內(nèi)，要認真參考資料，多多學習CAD軟件，加快速度完成設(shè)計。 學生簽字：譚鴻亮 指導教師 意 見 指導教師簽字： 年 月 日 教研室 意 見 教研室主任簽字： 年 月 日 SY-025-BY-2 畢業(yè)設(shè)計（論文）任務(wù)書 學生姓名 譚鴻亮 系部 汽車與交通工程院 專業(yè)、班級 車輛工程07-10 指導教師姓名 趙晨光 職稱 講師 從事 專業(yè) 車輛工程 是否外聘 □是否 題目名稱 乘用車機械式變速器設(shè)計 一、設(shè)計（論文）目的、意義 汽車變速器是汽車傳動系的重要組成部分。由于汽油機額定轉(zhuǎn)矩對應(yīng)的速度范圍很小，需要用齒輪傳動來適應(yīng)駕駛時車速的變化。它是傳動系的主要部件,它的性能對整車的動力性、燃油經(jīng)濟性以及乘坐舒適性等方面都有十分重要的影響。設(shè)計好變速器對汽車的性能，安全性以及經(jīng)濟性有著重要作用。 手動機械變速器可以完全遵從駕駛者的意志，且結(jié)構(gòu)簡單、傳動效率高、故障率相對較低、物美價廉,因此在市場上仍占有一席之地，開發(fā)手動機械變速器也適應(yīng)當代世界經(jīng)濟的發(fā)展。隨著科技的高速發(fā)展，節(jié)能與環(huán)境保護、應(yīng)用新型材料、高性能及低成本都可將作為汽車新型變速器的研究方向。 二、設(shè)計（論文）內(nèi)容、技術(shù)要求（研究方法） 基本內(nèi)容：在保證汽車有必要的動力性和經(jīng)濟性的前提下，進行齒輪和傳動軸設(shè)計，設(shè)置動力輸出裝置，保證換擋迅速、省力、方便，工作可靠。有較高的工作效率，除此之外，還要保證變速器滿足輪廓尺寸和質(zhì)量小、制造成本低、維修方便等要求。在設(shè)計中要解決的的主要問題：在設(shè)計中需要解決變速器是否能有效預(yù)防脫檔，跳檔并方便掛檔。減小噪音并盡量能達到輕量化、高承載、低噪聲、換檔操縱好和經(jīng)濟實用性。具體內(nèi)容包括：變速器軸、齒輪的設(shè)計；變速器操縱機構(gòu)的設(shè)計；變速器軸及齒輪的校核。 技術(shù)要求：具有良好的動力性與經(jīng)濟性，換擋迅速、省力、方便。變速器的工作噪聲低，變速器還應(yīng)當滿足輪廓尺寸和質(zhì)量小、制造成本低、拆裝容易、維修方便等要求。 三、設(shè)計（論文）完成后應(yīng)提交的成果 1.變速器的總裝配圖一張（A0）； 2.變速器的部件圖、零件圖（軸及齒輪等）折合兩張以上零號圖（A1、A2若干張）； 3.撰寫設(shè)計說明書一份，1.5萬字以上。 四、設(shè)計（論文）進度安排 1.調(diào)研，資料收集，完成開題報告 第1～2周(2月28日-3月13日) 2.分析搜集到的資料，提出最優(yōu)設(shè)計方案，進行相關(guān)計算 第3～5 周(3月14日-4月3日) 3.繪制機械變速器總裝配圖及零部件圖的草圖 第6～8周（4月4日-4月24日） 4.繪制機械變速器總裝配圖、零件圖，撰寫設(shè)計說明書 第9～12周（4月25日-5月22日） 5. 完善設(shè)計，提交指導老師審核并修改 第13～14周(5月23日-6月5日) 6. 提交系里評閱并修改，準備答辯 第15～16周(6月6日-6月19日) 7. 畢業(yè)設(shè)計答辯 第17周(6月20日-6月26日) 五、主要參考資料 [1] 劉惟信.汽車設(shè)計[M].北京.清華大學出版社.2001. [2] 王望予.汽車設(shè)計[M].北京.機械工業(yè)出版社.2004. [3] 常思勤.汽車動力裝置[M].北京.機械工業(yè)出版社.2005. [4] 林紹義.一種汽車變速器設(shè)計[J].機電技術(shù)，2004.1. [5] 劉法順.乘用車兩軸式機械變速器的設(shè)計[J].交通科技與經(jīng)濟，2008.4. [6] 羅春香.汽車變速器設(shè)計中速比分配問題的研究[J].西南民族大學學報·自然科學版，2004.30. [7] 韋志林.汽車變速器軸承壽命的校核計算[J].廣西工學院學報,2000.6. [8] 王之煦,許杏根.簡明機械設(shè)計手冊[M].北京:機械工業(yè)出版社,1997.9. [9] 嚴倉鋒.變速器后蓋總成軸承裝配技術(shù)改造[J].實用技術(shù),2005.12. 六、備注 指導教師簽字： 年 月 日 教研室主任簽字： 年 月 日 附件：畢業(yè)論文排版示例 本科學生畢業(yè)設(shè)計 乘用車機械式變速器設(shè)計 項目名華文中宋四號字，填加文字楷體_GB2312小三號居下劃線中 院系名稱： 汽車與交通工程學院 專業(yè)班級： 車輛工程 07-10班 學生姓名： 譚鴻亮 指導教師： 趙晨光 職 稱： 講師 黑 龍 江 工 程 學 院 二○一一年六月 論文封面示例，同前 外文封面示例Times New Roman體，字號與中文對應(yīng) The Graduation Thesis for Bachelor's Degree The Design of the Mechanical Transmission of Passnger Candidate：Tan Hong liang Specialty：Vehicle Engineering Class： BW07-10 Supervisor：Zhao Chen guang Lecturer Heilongjiang Institute of Technology 2011-06·Harbin