4座微型客貨兩用車設計（后驅動橋、后懸設計）,微型,客貨兩用車,設計,驅動 車輛與動力工程學院畢業(yè)設計說明書 4座微型客貨兩用車設計 （后驅動橋、后懸設計） 摘 要 本設計為4座微型客貨兩用車的后驅動橋、后懸架設計。參照現(xiàn)有的生產技術水平，綜合考慮生產成本，以及使用條件等多種因素, 經過收集各類型的后驅動橋、懸架的資料、實車觀測和老師的指導，完成了本次設計。 本次設計確定采用整體式驅動橋。其主減速器為單級，采用準雙曲面齒輪傳動，差速器采用普通對稱式圓錐齒輪對稱式圓差速器，全浮式半軸，整體鑄造式驅動橋殼。主減速器齒輪主要設計的是雙曲面齒輪的尺寸、校核及材料選擇；差速器主要計算的是對稱式圓錐齒輪的主要參數(shù)計算及校核；半軸設計主要是根據(jù)強度來確定半軸的半徑和半軸的結構設計及材料與熱處理；驅動橋橋殼既是承載件又是傳動件，因此橋殼需要有足夠的強度和剛度。 后懸架采用鋼板彈簧式非獨立懸架，其需要計算的內容比較廣泛，但也主要是集中在對彈性元件的計算上。計算包含了從滿載弧高，各鋼板彈簧片長度、厚度、寬度，到整個懸架系統(tǒng)的動、靜撓度值的確定。這是因為在懸架系統(tǒng)中，鋼板彈簧既是它的彈性元件又是它的導向機構，是其最為重要的部件。 綜合各部分的設計與校核的結果，本次設計基本能滿足其設計要求。 關鍵詞：后驅動橋, 整體式，非獨立懸架，鋼板彈簧 THE DESIGNING FOR THE MINIATURE MOTORCAR TO CARRY PERSONS AND GOODS WITH 4 SEATS （THE DESIGN OF BACK DRIVING AXLE AND REAR SUSPENSION） ABSTRACT This design is for the back driving axle and back suspension of the miniature motorcar to carry persons and goods with 4 seats. According to the existing production technique level, synthesize the consideration production cost, and use the condition etc. various factor. In weeks , there was much useful information about the back driving axle and the rear suspension collected. With the helping of my teacher ,and observation on vehicle in laboratory , this designing is completed. This design assurance adopts the whole type to drive the bridge. Its lord decelerates the machine as single class, the adoption allows a curved face wheel gear to spread to move, differ soon the machine adopt the common and symmetry type cone wheel gear symmetry type circle differ soon machine, the whole float type half stalk, hurtle to cast the whole type to drive the bridge hull. The lord mainly decelerate the machine wheel gear what to design is a pair of pit and the material choice of size, school of curved faces wheel gear. Bad soon machine mainly what to compute is the main parameter calculation and school pits of the symmetry type cone wheel gear.The half stalk design is mainly the basis strength to certain structure design and material and hot processingses of the radius and half stalk of the half stalks. Drive the bridge bridge hull since is to load the piece and is to spread to move the piece, so the bridge hull needs to have the enough strength and just degree. The design of the rear suspension adopts unindependent suspension with steeel spring. It has more data computation.There are entire rate of rear suspension, heavy load arch high ,dynamic distortion quantity,the different length of different leaf brade, thickness and width of them.Those are indispensable data in suspension of a vehicle. The result of design and school pit of comprehensive each part, this time design basic can satisfy it designs the request. KEY WORDS：back driving axle， the whole type， unindependent suspension，steeel spring 目 錄 第一章 前言............. ...................... ........1 第二章 驅動橋結構設計.................................2 §2.1驅動橋的組成與結構方案分析......................2 §2.2 主減速器的結構形式的分析和確定..................2 §2.2.1 主減速器傳動齒輪的類型......................2 §2.2.2 主減速器的減速形式..........................3 §2.3差速器的方案分析及確定......................... .3 §2.4半軸............................................3 §2. 5驅動橋殼結構方案分析............................4 第三章 驅動橋尺寸計算 .................................5 §3.1主減速器的基本參數(shù)選擇與設計計算................5 §3.1.1主減速比的確定.............................5 §3.1.2主減速器齒輪計算載荷的確定.................. 5 §3.1.3主減速器齒輪基本參數(shù)的選擇.................. 6 §3.2差速器的基本參數(shù)選擇與設計計算.................17 §3.2.1差速器齒輪的基本參數(shù)的選擇................. 17 §3.2.2差速器齒輪的幾何尺寸設計計算............... 18 §3.3全浮式半軸的設計計算...........................20 §3.4驅動橋橋殼的設計計算...........................21 §3.4.1驅動橋殼結構方案分析....................... 21 §3.4.2驅動橋殼強度計算........................... 22 第四章 驅動橋強度計算.................................28 §4.1主減速器準雙曲面齒輪的強度校核.................28 §4.1.1單位齒長圓周力............................. 28 §4.1.2輪齒的彎曲強度計算 ........................29 §4.1.3輪齒的彎曲強度計算......................... 30 §4.2差速器齒輪的強度計算...........................30 §4.3半軸強度計算...................................31 §4.3.1半軸扭轉應力............................... 31 §4.3.2半軸的最大扭轉角........................... 31 第五章 軸承的壽命計算.................................33 §5.1主減速器主動錐齒輪支承軸承的計算...............33 §5.1.1主減速器主動齒輪上的當量轉矩的計算....... 33 §5.1.2主從動錐齒輪齒面寬中點處的圓周力p的計算....33 §5.1.3雙曲面齒輪的軸向力與徑向力的計算........... 33 §5.1.4懸臂式支承主動錐齒輪的軸承徑向載荷的確定... 34 §5.1.5軸承壽命的計算............................. 35 §5.2從動齒輪支承軸承校核...........................36 §5.2.1單級主減速器從動齒輪支承軸承徑向載荷的確定. 36 §5.2.2軸承壽命計算............................... 36 第六章 后懸架結構分析.................................38 §6.1懸架概述.......................................38 §6.2懸架結構形式和布置的分析.......................38 第七章 后懸架參數(shù)確定和尺寸計算.......................40 §7.1總體布置及其基本參數(shù)...........................40 §7.2彈性元件的設計計算.............................40 §7.2.1鋼板彈簧的布置方案......................... 40 §7.2.2鋼板彈簧結構尺寸參數(shù)計算................... 40 §7.3后懸架減振器的設計與計算....................... 47 §7.3.1選取相對阻尼系數(shù)..........................47 §7.3.2最大卸荷力的確定..........................47 §7.3.3減振器工作缸直徑D的確定....................47 第八章 結 論..........................................48 參考文獻...............................................49 致謝...................................................50 V 畢 業(yè) 設 計（論文）任 務 書 （指導老師填表） 學生姓名 專業(yè) 班級 指導 老師 課題 類型 設計（論文）題目 4座微型客貨兩用車設計（后驅動橋、后懸架設計） 主要研 究內容 4座客貨兩用車的基本參數(shù)為：發(fā)動機擬選為JL462Q或相近系列，最高車速為95Km/h，最小轉彎半徑≤4.5米，乘員人數(shù)4人，載重量0.5噸，檔位數(shù)4+1。 參照上述基本參數(shù)，查閱汽車設計相關標準，參照現(xiàn)有車型的整體布局參數(shù)（網上可以查到，如昌河CH10011AXEi廂貨、長安火車系列等）、亞洲牌客貨兩用車底盤實物、長劍牌轎車實物（車輛實驗室整車陳列室內），進行必要的調研和資料查閱，設計出合適現(xiàn)代社會需要的客貨兩用車。 主要技 術指標 （或研究目標） 完成客貨兩用車的后驅動橋、后懸架設計。繪制總和不少于3張的零號圖紙的結構設計圖、裝配圖和零件圖，其中應包含用計算機繪制（或手工繪制）的具有中等難度的1號圖紙一張以上。 按要求格式獨立撰寫不少于12000字的設計說明書，應有中英文摘要（摘要不少于400字），全部用計算機打?。ň幣乓蟮胶幽峡萍即髮W教務處網站查：《河南科技大學畢業(yè)設計（論文）指導手冊》），查閱與課題相關的文獻資料15篇以上，獨立完成總量10000以上印刷符號與本人相關的外文資料譯文。 速度計劃 （6~7周）全組集體討論，確定總體方案。每個學生確定自己的設計內容與繪圖數(shù)量。在進行調研、搜集、分析資料的基礎上，完成開題報告（4月14日交）。 （8~9周）整理本設計內容的相關數(shù)據(jù)資料，進行必要的理論計算，擬出說明書草稿，搜集相關外文資料并翻譯。 （10~11周）完成主要總圖設計。（5月5日下午至少完成一張零號草圖）。 （12~13周）完成零、部件圖設計，并完成機繪圖。（5月23下午之前完成）。 （14~15周）要求整理、編寫設計說明書。 （ 16周）整理圖紙及全部設計文件，準備上交。（6月13日下午四點交全部設計資料）。 （ 17周 ）審閱、評閱設計資料，答辯，評定成績。 主要參 考文獻 汽車構造； 汽車理論； 汽車設計； 汽車車身設計結構與設計； 車身造型； 汽車車型手冊； 有關汽車行業(yè)雜志； 機械零件設計手冊； 汽車相關行業(yè)標準（院資料室） 研究所（教研室）主任簽字： 年 月 日 Suspension performance testing The suspension system, while not absolutely essential to the operation of a motor vehicle, makes a big difference in the amount of pleasure experienced while driving. Essentially, it acts as a "bridge" between the occupants of the vehicle and the road they ride on. The term suspension refers to the ability of this bridge to "suspend" a vehicle's frame, body and powertrain above the wheels. Like the Golden Gate Bridge hovering over San Francisco Bay, it separates the two and keeps them apart. To remove this suspension would be like taking a cool dive from the Golden Gate: you might survive the fall, but the impact would leave you sore for weeks. Think of a skateboard. It has direct contact with the road. You feel every brick, crack, crevice and bump. It's almost a visceral experience. As the wheels growl across the pavement, picking up a bump here, a crack there, the vibration travels up your legs and settles in your gut. You could almost admit you were having fun, if you didn't feel like you were gonna toss your tacos at any second. This is what your car would feel like without a suspension system. In the interests of road safety, it is logical to include in periodic roadworthiness tests an inspection of vehicle suspension performance. The results of tests with a prototype machine are presented and a specification proposed for a valid suspension test. Demonstrations organized by the European Shock Absorbers Manufacturers’ Association ( EuSAMA) in many countries have drawn attention to the importance of correctly functioning shock absorbers. In the United Kingdom it is anticipate that the Department of the Environment will include a specific shock absorber check in the MOT Test with effect from January 1977. Of the machines currently available for testing shock absorbers without removing them from the vehicle, there is no real consensus of opinion concerning their validity to evaluate suspension safety objectively. But it is felt that possible more stringent legislation on European periodic vehicle tests in the future will demand a form of objective testing on equipment that is incapable of erroneous interpretation. Since its formation in 1971 EuSAMA has realized the imnportance of the problem, and initially charged its technical sub-committee with the task of examining and analyzing the various test machines then available. Two basic types of machine were offered at that time for diagnosing faulty shock absorbers. These were: Machines which lift up the wheels on an axle by about 100 mm and then let them drop. The subsequent displacements of the body on each side are recorded and the results compared with preset values for the particular vehicle and the suspension position, front or rear. Such a machine simulates a step input and records the subsequent body movements (see Fig 1). Machines which measure wheel movements induced by the exitation of the suspension through a frequency scan from above resonance frequency to zero, applied by means of a spring-supported platform under the tyre. Results are recorded in the form of wheel displacement against time. While passing through the wheel bounce resonant frequency the maximum amplitude is obtained and this is compared with preset values for the particular vehicle and the suspension position front or rear (see Fig 2). A third machine, introduced later, measures phase shift induced by the excitation of the suspension at a constant frequency and stroke, applied by means of a vibrating platform under the tyre. The phase shift between the moment of excitation and the force-reaction is recorded and the result is compared with preset values for the particular vehicle and suspension position (see Fig 3). These systems have three fundamental drawbacks: A: The actual damping is compared with the original damping the limit being a certain degradation in comparison with the original performance. The original performance, however, can already be marginal. B: The problems of limit setting, namely by whom should the limits be set and what are the criteria they should about? At present there is hardly any relation between set limits and acceptable performance in practice. C: The practical problem of various limits for different vehicle types and their suspensions. This requires comprehensive reference manuals that need continuously updating. Despite these fundamental drawbacks, examples of the ? widely used test machines were put through their paces by the Automotive Engineers Laboratory of the University of Ghent, as well as by several EuSAMA members. As expected, the first conclusion is that no test method which does not include dismantling the shock absorbers from the vehicle is able to furnish information concerning the shock absorber alone, and it is in fact the whole of the vehicle suspension system that is tested. This can be considered as a positive aspect of testing, since the whole of the suspension should be in good condition for safety; although the shock absorber is the component most likely to deteriorate with use, other defects such as incorrectly inflated tyres, broken springs or seized ball-joins should if possible be diagnosed. Of the other factors which influenced test results it was found that all machines gave results that were much affected by shock absorber temperature. In the case of the drop type testing machines, defects in shock absorbers caused by high frequency excitation could not be detected. With the frequency scan type of machine, approximately constant force input implies a big difference in results between vehicles with soft or hard suspension, so that changes in springs from normal to heavy duty (which the operator may be incapable of identifying ) can considerable affect the result. Each make of machine had its own characteristics, but as the basic test principles were considered to be unacceptable these details will not be presented here. After due consideration the technical sub-committee advised the General Assembly of EuSAMA that although the existing machines, when correctly operated, could help to diagnose many faulty shock absorbers, a responsible association could not authorize such equipment as the parameters measured were not considered technically representative of any particular aspect of roadworthiness. Taking brake testing as an example, it was noted that test machines give a direct reading of braking efficiency as a percentage of g without the need to identify vehicle type or to use reference manuals. Similarly, minimum braking performance levels can be set for all automobiles irrespective of model, so that a customer knows immediately if his brakes need attention, Some machines show brake imbalance, but do not indicate which component is faulty. Applying the same principles to vehicle suspension, it should be possible to propose a test which furnishes a direct reading as a value or preferably as a percentage, to indicate whether a suspension is considered satisfactory from the viewpoint of safety. Moreover, this must be achieved objectively, that is to say without need of any identification, interpretation or reference to manuals by the test operator. The technical sub-committee therefore looked for a parameter which could be considered a suitable criterion of safety in relation to vehicle suspension. As stated earlier, there is only one component normally subject to deterioration with use—the shock absorber. So the role of the shock absorbers must first be defined. These have two functions to perform: to damp the movement of the vehicle body on its springs and to control wheel bounce. The permitted movement of a vehicle body on its springs is very much a matter of taste, and it is largely in the control of such movement that a sports shock absorber differs in damping characteristics from a shock absorber aimed at optimum comfort. The movement of a body on its springs does, of course, materially influence roadholding but in reality few ordinary drivers are capable of reaching the limits of the modern car in this respect, so the value of body damping is relatively unimportant for safety measurements. In any case, most drivers of a vehicle with poor body damping will quickly limit their speed and manoeuvres to the vehicle’s handling capacity. Wheel bounce, on the other hand, is a measurable phenomenon and the dangers of vehicles with uncertain wheel contact are well known. Both cornering and braking performance are well known. Both cornering and braking performance are limited by tyre anherence to the road; this is dependent on the vertical wheel contact as well as the tyre’s own properties. A parameter which permits the objective measurement of one　aspect of roadholding, and therefore of vehicle suspension safety, was thus isolated but it was still necessary to be able to express it in terms that could be readily interpreted.It was proposed, therefore, to measure the minimum remaining vertical contact force between tyre and road under a given excitation at wheel-bounce frequency and to express it as a percentage of the static wheel load. Such a possibility was discussed at a meeting between the technical sub-committee and Dr Verschoore of the University of Ghent. A general concensus of opinion in favour of such a test was reached, though some members expressed doubts concerning the possibility of measuring this parameter in practice, as well as doubts concerning the results Aparamet。. At a later date the sub-committee was informed that a prototype machine of German origin, using approximately the principle outlined above, had been submitted for evaluation to the University of Ghent. After certain recommended modifications had been performed, tests by both the University of Ghent and a member company of EuSAMA demonstrated the possibilities of such a test, and amply justified the technical sub-committee’s decision concerning the parameter to be measured. Details are given below of the tests performed and the results obtained on a prototype machine, developed by Maschingfabrik Koppern & Co, Hattingen, West Germany, and presented by courtesy of S A Monroe International, Brussels, Belgium. The machine (see Fig 4) Wheel movement is induced by excitation of the suspension through a frequency scan from about 25 Hz to 0, applied by a platform under the tyre, moving with a fixed stroke of 6 mm. One wheel is tested at a time. Results are recorded in the form of Minimum dynamic wheel load *100% Static wheel load The tester’s analogue read-out showed deviations from the maximum dynamic force indicated on the oscilloscope. Test readings are compared with the impressions of an experienced test driver because no scientific test method for roadworthiness has yet been approved. The final determination of roadworthiness and vehicle comfort is still done by vehicle manufactures by the subjective assessment of one or more experienced test drivers. The test method outlined below will indicate in nearly all cases whether a vehicle suspension is roadworthy or not. Nevertheless, a visuall inspection of the suspension elements is recommended in addition to the performance test, as incipient failures can sometimes be detected visually before performance deteriorates. Secondly, the test is of the vehicle suspension, wheel by wheel, and will indicate only whether there is a fault; it will not locate the fault, though a skilled operator may be able to diagnose certain defects from the test read-out. Obviously there is a requirement to design a machine able to detect when a certain percentage of static friction is exceeded. Development work in this area is still required. While there have been enhancements and improvements to both springs and shock absorbers, the basic design of car suspensions has not undergone a significant evolution over the years. But all of that's about to change with the introduction of a brand-new suspension design conceived by Bose -- the same Bose known for its innovations in acoustic technologies. Some experts are going so far as to say that the Bose suspension is the biggest advance in automobile suspensions since the introduction of an all-independent design. How does it work? The Bose system uses a linear electromagnetic motor (LEM) at each wheel in lieu of a conventional shock-and-spring setup. Amplifiers provide electricity to the motors in such a way that their power is regenerated with each compression of the system. The main benefit of the motors is that they are not limited by the inertia inherent in conventional fluid-based dampers. As a result, an LEM can extend and compress at a much greater speed, virtually eliminating all vibrations in the passenger cabin. The wheel's motion can be so finely controlled that the body of the car remains level regardless of what's happening at the wheel. The LEM can also counteract the body motion of the car while accelerating, braking and cornering, giving the driver a greater sense of control. Unfortunately, this paradigm-shifting suspension won't be available until 2009, when it will be offered on one or more high-end luxury cars. Until then, drivers will have to rely on the tried-and-true suspension methods that have smoothed out bumpy rides for centuries.