畢業設計中型專用汽車變速器設計說明書-文庫吧在線文庫

　　

【正文】 K—經驗系數，K=，取 K=4—發動機最大轉矩 ,求得 D= 齒輪模數的確定本變速器設計一、倒擋為直齒，其它擋為斜齒，選取齒輪模數要保證齒輪有足夠的剛度，同時兼顧它對噪聲和質量的影響，減少模數、增加齒寬會使噪聲降低，反之則能減輕變變速器的質量。因此，從提高低檔齒輪的彎曲強度出發，并不希望 β 角過大，而從提高高檔齒輪的接觸強度著眼，可選取較大的 β 角。對于本次設計，當直齒輪 17 時，采用正變位，和它相嚙合的齒輪則采用負minZ?變位。本科生畢業設計（論文）9同步器的工作原理：在變速瞬間,變速器的輸入端和輸出端的轉速都在變化著,輸出端與汽車整車相連其轉動慣量 J 出相當大,換檔作用時間較短,可認為在換檔的瞬間輸出端轉速是恒定的。慣性式同步器是依靠摩擦作用實現同步的，在其上面設有專設機構保證接合套與待接合的花鍵齒圈在達到同步之前不可能接觸，從而避免了齒間沖擊。1 同步環錐面螺紋和油槽的設計為了破壞被同步齒輪內錐面上的油膜,增大摩擦力矩,同步環錐面上需車制螺紋,并在螺紋垂直方向開設排油槽,油槽的大小及數量應根據同步環錐面直徑來確定。4 同步器鎖止角的確定要使同步環在同步階段中鎖止,必須滿足鎖止條件:tanβ≥R 錐 μR 鎖sinα。7 齒套接合齒的設計同步器齒套接合齒的模數、齒數應根據所傳遞的最大扭矩來確定。a 、b～為齒輪上作用力矩與支座 A、B 的距離，L～為支座間的距離。（3）為了防止在汽車前進時誤掛倒擋，導致零件損壞，在操縱機構中設有倒擋鎖裝置。起到了自鎖的作用。軸承的選用應符合國家標準規定的系列，同時包括軸的直徑，但應以齒輪作為選取軸承的標準，因為軸承是標準件。它由取力機構齒輪箱、操縱機構、傳動軸、泵架等組成。取力器一軸的強度校核： ； mZmrn ?????本科生畢業設計（論文）30???rTFen ???n . ；a40mb64012?所以 ???EILFfc 合格.~5.? . ??Ibafs rad????????EILF? 合格rad2.?mNMc ??? 217 2323 ?????? ； 合格??240mN?????取力器二軸的強度校核： ； NZr16 ???rTFen ?????nFNii2 ；ma6b8162?所以 ???EILfc ~5.??IbaFfs rad?????????EIL? 合格rad02.?NFMc ???16本科生畢業設計（論文）31mNaFMs ???? 233 ????? ； 合格??240mN?????齒輪彎曲應力計算:直齒： ???yKzTfgw3斜齒： ???zmgw3os2?式中：—彎曲應力（ ）w?2/NT —計算載荷（N操縱機構還設有自鎖和互鎖裝置。特別感謝 XXX 老師在這次畢業設計中給我的鼓勵、支持和幫助。 which causes the drive wheels to turn in the opposite direction allowing you to back up. Finally, there is the Park position. In this position, a latch mechanism (not unlike a deadbolt lock on a door) is inserted into a slot in the output shaft to lock the drive wheels and keep them from turning, thereby preventing the vehicle from rolling. There are two basic types of automatic transmissions based on whether thevehicle is rear wheel drive or front wheel drive. On a rear wheel drive car, the transmission is usually mounted to the back of the engine and is located under the hump in the center of the floorboard alongside the gas pedal position. A drive shaft connects the rear of the transmission to the final drive which is located in the rear axle and is used to send power to the rear wheels. Power flow on this system is simple and straight forward going from the engine, through the torque converter, then through the transmission and drive shaft until it reaches the final drive where it is split and sent to the two rear wheels. On a front wheel drive car, the transmission is usually bined with the final drive to form what is called a transaxle. The engine on a front wheel drive car is usually mounted sideways in the car with the transaxle tucked under it on the side of the engine facing the rear of the car. Front axles are connected directly to the transaxle and provide power to the front wheels. In this example, power flows from the engine, through the torque converter to a large chain that sends the power through a 180 degree turn to the transmission that is along side the engine. From there, the power is routed through the transmission to the final drive where it is split and sent tothe two front wheels through the drive axles. There are a number of other arrangements including front drive vehicles where the engine is mounted front to back instead of sideways and there are other systems that drive all four wheels but the two systems described here are by far the most popular. A much less popular rear drive arrangement has the transmission mounted directly to the 本科生畢業設計（論文）37final drive at the rear and is connected by a drive shaft to the torque converter which is still mounted on the engine. This system is found on the new Corvette and is used in order to balance the weight evenly between the front and rear wheels for improved performance and handling. Another rear drive system mountseverything, the engine, transmission and final drive in the rear. This rear enginearrangement is popular on the Porsche.Transmission Components The modern automatic transmission consists of many ponents and systems that are designed to work together in a symphony of clever mechanical, hydraulic and electrical technology that has evolved over the years into what many mechanically inclined individuals consider to be an art form. The cyeloid driveThe cyeloid drive has the essential advnatages sueh as Wide rnage of tranmsission ratio， eompact surtcture，high relibaility nad long wokrnig lief，So It gets borad application and its rsearch goes deep eonstnatly. The drive has been not only applied to traditionalt rnasmissionfield but also has alluring applieation in the aspeets of micro machine，robot gear ,preeision machine taansmission，super mini cycloid drive， asrtonaut cquipment，measurment apparatus，tenement intelligence and hightech equipment. In the family of the cycloid drive，the AFcycloid 一 pin wheel plnaetary driver educer is a new .Trnasmission with the mon cycloid drive，it has a series of advantages such as small volume，lihgtweight，wide range of tranmsission，diversity transmission，long lief time，high rigidiyt，high slewing precision，stbale preeision，high effieiency and stable design of the drive daopts a lot of advnaced theories and technology methoods and uses a kind of innovation stureurte，so the FA drive has overe the defect of the traditional surtcture，enhnaccd the transmissin efficency，volume,and the transmission precision. Automatic transmissions contain many gears in various binations. In a manual transmission, gears slide along shafts as you move the shift lever from one position to another, engaging various sized gears as required in order to provide the correct gear ratio. In an automatic transmission, however, the gears are never physically moved and are always engaged to the same gears. This is acplished through the use of plaary gear sets. One example of a way that this system can be used is by connecting the ring gear 本科生畢業設計（論文）38