新型车用无级变速器（BVT）自适应加压机构研究

发布时间：2019-05-17 09:34

【摘要】：随着环境污染和能源匮乏的日益严重,节能与环保已经成为未来的发展方向,而车用无级变速器具备较好燃油经济性受到业界的广泛重视,为此,本课题组提出了基于半环形CVT的结构基础的无级变速器——BVT。本文对BVT中的阿基米德螺旋面自适应加压机构进行理论分析、仿真分析和实验研究,主要的研究工作如下：(1)根据BVT对加压机构的性能要求,查阅国内外参考文献,指出第一代样机中的钢球V型槽自适应加压机构的不足,提出了本文的研究内容及研究目标。(2)为了比较螺旋面与钢球V型槽自适应加压机构的性能,分别对两种加压机构进行了受力分析和强度分析,优化了螺旋面的结构参数,验证了两种加压机构均满足整车行驶工况的要求,而前者比后者具有传动系数小、抗冲击能力强的优点,具有更优越的自适应加压性能。(3)运用有限元分析软件ABAQUS,分别对螺旋面和钢球V型槽自适应加压机构在整车行驶工况下进行接触应力分析。通过两种加压机构的计算结果对比可知,螺旋面自适应加压机构满足整车行驶工况的要求且接触应力更小。同时将理论分析和有限元分析进行对比,结果显示,两种计算结果基本相符,可作为螺旋面自适应加压机构强度校核的依据。(4)利用虚拟样机仿真软件ADAMS,采用多柔体系统动力学方法,分别建立螺旋面和钢球V型槽自适应加压机构的多柔体系统模型,并进行仿真研究,得到了加压机构在整车行驶工况下的仿真曲线。通过对比,验证了理论计算和仿真实验的有效性,以及螺旋面自适应加压机构具有更优越的自适应加压性能。(5)在实验台架上完成了BVT第二代(螺旋面自适应加压机构)物理样机的空载测试和加载测试。通过对两种加压机构实验结果同理论分析及仿真分析的对比,验证了螺旋面自适应加压机构具有承载能力大、加压性能稳定可靠优势,满足BVT的加压需求。本文验证了螺旋面自适应加压机构在整车行驶工况下工作的可靠性,为课题组针对BVT的进一步开发提供参考。
[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.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.212

【参考文献】