【摘要】：隨著環(huán)境污染和能源匱乏的日益嚴重,節(jié)能與環(huán)保已經(jīng)成為未來的發(fā)展方向,而車用無級變速器具備較好燃油經(jīng)濟性受到業(yè)界的廣泛重視,為此,本課題組提出了基于半環(huán)形CVT的結構基礎的無級變速器——BVT。本文對BVT中的阿基米德螺旋面自適應加壓機構進行理論分析、仿真分析和實驗研究,主要的研究工作如下：(1)根據(jù)BVT對加壓機構的性能要求,查閱國內外參考文獻,指出第一代樣機中的鋼球V型槽自適應加壓機構的不足,提出了本文的研究內容及研究目標。(2)為了比較螺旋面與鋼球V型槽自適應加壓機構的性能,分別對兩種加壓機構進行了受力分析和強度分析,優(yōu)化了螺旋面的結構參數(shù),驗證了兩種加壓機構均滿足整車行駛工況的要求,而前者比后者具有傳動系數(shù)小、抗沖擊能力強的優(yōu)點,具有更優(yōu)越的自適應加壓性能。(3)運用有限元分析軟件ABAQUS,分別對螺旋面和鋼球V型槽自適應加壓機構在整車行駛工況下進行接觸應力分析。通過兩種加壓機構的計算結果對比可知,螺旋面自適應加壓機構滿足整車行駛工況的要求且接觸應力更小。同時將理論分析和有限元分析進行對比,結果顯示,兩種計算結果基本相符,可作為螺旋面自適應加壓機構強度校核的依據(jù)。(4)利用虛擬樣機仿真軟件ADAMS,采用多柔體系統(tǒng)動力學方法,分別建立螺旋面和鋼球V型槽自適應加壓機構的多柔體系統(tǒng)模型,并進行仿真研究,得到了加壓機構在整車行駛工況下的仿真曲線。通過對比,驗證了理論計算和仿真實驗的有效性,以及螺旋面自適應加壓機構具有更優(yōu)越的自適應加壓性能。(5)在實驗臺架上完成了BVT第二代(螺旋面自適應加壓機構)物理樣機的空載測試和加載測試。通過對兩種加壓機構實驗結果同理論分析及仿真分析的對比,驗證了螺旋面自適應加壓機構具有承載能力大、加壓性能穩(wěn)定可靠優(yōu)勢,滿足BVT的加壓需求。本文驗證了螺旋面自適應加壓機構在整車行駛工況下工作的可靠性,為課題組針對BVT的進一步開發(fā)提供參考。
[Abstract]:With the increasing severity of environmental pollution and lack of energy, energy saving and environmental protection have become the development direction in the future, and the fuel economy of vehicle CVT has been paid more and more attention by the industry. Our research group puts forward BVT., which is based on the structure of semi-annular CVT. In this paper, the Archimedes spiral adaptive compression mechanism in BVT is analyzed theoretically, simulated and studied experimentally. the main research work is as follows: (1) according to the performance requirements of BVT for compression mechanism, the references at home and abroad are consulted. The shortcomings of the steel ball V-groove adaptive compression mechanism in the first generation prototype are pointed out, and the research contents and research objectives of this paper are put forward. (2) in order to compare the performance of the spiral surface and the steel ball V-groove adaptive compression mechanism, The stress analysis and strength analysis of the two kinds of compression mechanisms are carried out respectively, and the structural parameters of the spiral surface are optimized, and it is verified that the two kinds of compression mechanisms meet the requirements of the driving condition of the whole vehicle, and the former has smaller transmission coefficient than the latter. It has the advantages of strong impact resistance and better adaptive compression performance. (3) the contact stress of spiral surface and V-groove adaptive compression mechanism of steel ball is analyzed by using the finite element analysis software ABAQUS, under the driving condition of the whole vehicle. (3) the contact stress of the spiral surface and the V-groove adaptive compression mechanism of the steel ball is analyzed by using the finite element analysis software FEA. Through the comparison of the calculation results of the two kinds of compression mechanisms, it can be seen that the spiral surface adaptive compression mechanism meets the requirements of the driving condition of the whole vehicle and the contact stress is smaller. At the same time, the theoretical analysis and finite element analysis are compared. the results show that the two calculation results are basically consistent, which can be used as the basis for strength check of spiral adaptive compression mechanism. (4) using virtual prototype simulation software ADAMS, By using the dynamic method of multi-flexible body system, the multi-flexible system models of spiral surface and steel ball V-groove adaptive compression mechanism are established respectively, and the simulation curves of the compression mechanism under the driving condition of the whole vehicle are obtained. Through comparison, the effectiveness of theoretical calculation and simulation experiment is verified. And the spiral surface adaptive compression mechanism has better adaptive compression performance. (5) the no-load test and loading test of the second generation (spiral surface adaptive compression mechanism) physical prototype of BVT are completed on the experimental bench. By comparing the experimental results of the two kinds of compression mechanisms with theoretical analysis and simulation analysis, it is verified that the spiral surface adaptive compression mechanism has the advantages of large bearing capacity, stable and reliable compression performance, and meets the pressure requirements of BVT. In this paper, the reliability of the spiral adaptive pressure mechanism under the driving condition of the whole vehicle is verified, which provides a reference for the further development of the research group for BVT.
【學位授予單位】：廣東工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U463.212

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