外文翻譯--變速箱各檔齒輪基本參數(shù)的選擇

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 thatll 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 forgear 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 angle 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 o f 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(dāng)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(dāng)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(dāng)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(dāng)壓力角為 17.5度時基圓齒厚為 5.341；當(dāng)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?，F(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(dāng)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