5000字翻译.docx

1、5000字翻译Design and Analysis of the Gemini Chain System in Dual ClutchTransmission of AutomobileAbstractChain drive system is widely used in the conditions of high-speed, overload, variable speed and load. Manystudies are focused on the meshing theory and wear characteristics of chaindrive system, but

2、 system design, analysis, and noise characteristics of the chain drive system are weak. System design and noise characteristic are studied for a new type Gemini chain of dual-clutch automatic transmission. Based on the meshing theory of silent chain, the design parameters of the Gemini chain system

3、are calculated and the mathematical models and dynamic analysis models of the Gemini chain system are established. Dynamic characteristics of the Gemini chain system is simulated and the contact force of plate and pin, plate and sprockets, the chain tension forces, the transmission error and the str

4、ess of plates and pins are analyzed. According to the simulation results of the Gemini chain system, the noise experiment about system is carried out. The noise values are tested at different speed and load and spectral characteristics are analyzed. The results of simulation and experimental show th

5、at the contact forces of plate and pin, plate and sprocketsare smaller than the allowable stress values, the chain tension force is less tha n ultimate tension and tran smissi on error is limited in 1.2%. The noise values can meet the requirements of in dustrial desig n, and it is proved that the de

6、sig n and an alysismethod of the Gem ini cha in system is scie ntific and feasible.The desig n and test system is built from an alysis to test ofGem ini cha in system. This research prese nted will provide acorresponding theoretical guidanee for the design and dynamic characteristics and noise chara

7、cteristics of chain drive system.Keywords: Gemini chain, system design, noise characteristic, dyn amic characteristic, tra nsmissi on error.1 In troducti onTransmission system is the core component of the automotive power trai n. Its excelle nt performa nee and perfecti on, play decisive roles in th

8、e automobile power performa nee, economy, comfortable and reliability. Dual clutch tran smissi on (DCT) can tran smit power without in terrupti on. Thus the shift time is shortened and the shift quality is effectively improved. DCT has inherited manyadvantages of the manual transmission, such as hig

9、h transmission efficiency, compact installation space, light weight, low cost etc. So it is the development direction in the automatic transmission industry.DCT available in automotive technology is shown in Fig. 1. The round pin silent chain transmission system is applied in the chain transmission

10、system studied in this paper. Up to now, manyscholars have done a lot of research in related areas. Based on the meshing theory of silent chain and sprocket, MENG Fan zhong, et al 1 - 4, presented a method which cancalculate the parameters of plate and sprocket. The meshing design system of chain pl

11、ate-sprocket-hob when plate and sprocket is meshing was studied in those papers. And the multivariate variation characteristic of silent chain plate and sprocket is expounded. Based on the silent chain simulation models, FENG Zeng ming, et al5 - 6, researched the meshing characteristic of chain driv

12、e system by analyzing the contact force and stress of plate and pin in different meshing period. Based on the abrasion test of chain drive system, CHENGYa bing, et al 7 - 9, studied the abrasion position surface morphology of plate, sprocket and pin. The transverse fluctuations of axial moving of si

13、lent chain using multi-body dynamics were analyzed by ZHANGWM, et al 10. The wear characteristics ofautomotive chain drive system from the microscopic view and analyzed the force characteristics of chain plate and pin at the Nano-level was studied by LI Bao lin, et al 11. Microstructure and performa

14、nce of contact surfaces of the tooth chain plate after quenching in the microscope was researched by FU Zhen ming, et al12. Dynamic response of the chain transmission system in composite and alternating conditions was studied by XU Li xin, et al13. Based on the meshing mechanism of chain plate and s

15、procket with in volute tooth proposed by XUE Yun na, et al14 - 15, WANG Yong, et al16,analyzed the modification coefficient of sprocket while the chain plate and sprocket meshing. They have achieved the change rules of different tooth profile from the modification coefficient changes. New double pit

16、ch rocker-pin silent chain for conveyors and sprocket tooth profile were studied by WANG Wen cheng, et al17, SUN Wei, et al18, they proposed a new type of double pitch rocker-pin silent conveyor chain and studied sprocket tooth profile and in volute sprocket tooth profile for effects on dynamic tens

17、ion of chains in the silent chain drive.Kcvursc aciir 4h gear 2nd gcar nn .rlnFig. 1. Schematic of DCT transmission systemMany other famous scholars have con ducted in-depth research in the chain transmission related fields. PERAIRAC M, et al 19, prese nted a method to establish multi-body dyn amics

18、 model of a cha in drive system with geometric mathematics, and an alyzedthe link velocity, acceleration, force and trajectory. YOUNGJ D, et al 20, proposed an arrangement of a non-symmetric and alternating engagement tooth profile, and a method for installing the damping rubber ring in the outside

19、sprocket to reduce meshing impact and vibration of roller chain drivesystem. FUJIMOTO N, et al 21, developed a method to achieve chain noise reduction by changing meshing tooth profile of the plate and the chain sprocket. MATSUDA al 22 presented a new silent chain and developed a silent chain with d

20、ouble-sided engagement, which can achieve multi axis drive in space. Based on by TROEDSSOI,N et al 23, presented a mathematical model, and developed a mathematical model. By this model, oscillation and force of the chain transmission system can be calculated directly. The choral action and transmiss

21、ion errors of a simple silent chain system was investigated by HUANG C, et al 24, they analyzed the choral action based on the tooth contact analysis of the chain with the driving sprocket.DCTtransmission system studied in this paper is a new type Gemini chain system of DCT based on an improved DCT

22、chaintransmission system. Based on the meshing theory of silent chain, a new Gemini chain transmission system is designed and the dynamic analysis model is established. Based on RecurDyn software, the dynamic characteristics are analyzed and evaluated. The noise characteristics of the Gemini chain t

23、ransmission system are analyzed through noise experimental. The innovation of this paper is the first time combined the design, simulation analysis and noise experimental which can improve the design and simulation. We can verification the rational of design through simulation analysis andexperime n

24、tal.2 Mathematic Modeli ng Established2.1Parameters desig n of plateAccording to the meshing theory of silent chain andsprocket and the desig n con diti ons of Gemini cha in system in dual clutch transmission, the plate design of the DCT Gemini chain transmission system is shown in Fig. 2. The mainp

25、arameters are: hole pitcha, apothem f, half angle of toothprofile a .Fig. 2. Plate parameter2.2Parameters desig n of sprocketThe sprocket design of the DCTGemini chain transmission system is show n in Fig. 3. The mai n parameters are: teeth nu mber Z,pitch p, pitch diameter d, tip diameter da and ro

26、ot diameter df, measureme nt over pi ns hR, measuri ng pin diameter dR. TheGem ini cha in system con sists of cran kshaft sprocket(Gemi nisprocket), clutch sprocket 1,clutch sprocket 2 , chain 1 andchain 2. The design parameters of sprockets are shown in Table1.Fig. 3. Sprocket parameterTabl L” Desi

27、gn parameters of sprocketsPariiietfTGemini sprocketClutchsprocket 1Clutchsprocket 2Tooth nunibtT I244256PitchpynimS.O30&QPitch diamtier (t mni603105,S141,1Root diameter 击nun51296.3Bl 7Tip diamerer 4/nirn554105140.4Nleaiucemwit over pmsDLUl63 2109144.4Nkasumg pm diameter血；mm5.0SO5.02.3Parameters defi

28、 niti on(1)Accord ing to the desig n requireme nts, the speed range of Gemini sprocket is defined from 0 to 6500 r/min.(2)The number of whole chain links must be calculated in the process of design and calculation of DCTGemini chain system. By calculation, the number of chain links between Gemini sp

29、rocket and clutch sprocket 1(chain1) is 70, the number of chain links between Gemini sprocket and clutch sprocket 2(chain 2) is 88.(3)Relative coordinate centers of the three sprockets are: the Gemini sprocket(0, 0, 0), clutch sprocket 1(75.79, 76.94, 0), the clutch sprocket 2(203.79, 76.94, 0) 。(4)

30、According to above calculation, the length of the chain 1 is L1=0.55 m. The length of chain 2 is L2=0.70m22 - 23。3 System Dynamic Characteristics Analysis3.1System dynamic modelAccording to the above parameters calculation of Gemini plate and sprockets, the three-dimensional (3D) model was establish

31、ed in CATIA as below. The plate 3D model is shown in Fig. 4(a) with plate material 50CrVA. The pin diameter is 2.98 mmwith pin material 20CrMnMo.The 3D model of Gemini sprocket is shown in Fig. 4(b). Its teeth number is 24 and the working tooth profile is involute with sprocket material 40Cr. The 3D

32、model of clutch sprocket 2 is shown in Fig. 4(c). The toothnumber is 42 and the working tooth profile is involute with sprocket material 40Cr. The 3D model of clutch sprocket 1 is shown in Fig. 4(d). The tooth number is 56 and the working tooth profile is in volute with sprocket material 40Cr. The material properties are show n in Table 2.3.2System dyn amic characteristicsAccord ing to the structure and layout of the dual clutch,the Gemini cha