载重子午线轮胎的配方优化技术

采用电子自旋共振及红外光谱技术，从分子水平下研究不同配方体系的硫化胶，在疲劳和磨耗时，同络结构的断裂，氧化，再化合等力学反应历程的动力学，并建立了数学模型，为轮胎配方优化提供了科学依据。     

A comparative study on the performance, emission and combustion studies of a DI diesel engine using distilled tyre pyrolysis oil–diesel blends

Alternate fuels like ethanol, biodiesel, LPG, CNG, etc., have been already commercialised in the transport sector. In this context, pyrolysis of solid waste is currently receiving renewed interest. The disposal of waste tyres can be simplified to a certain extent by pyrolysis. In the present work, the crude tyre pyrolyisis oil (TPO) was desulphurised and then distilled through vacuum distillation. Also, two distilled tyre pyrolysis oil (DTPO)–diesel fuel (DF) blends at lower and higher concentrations were used as fuels in a four stroke single cylinder air cooled diesel engine without any engine modification. The results were compared with diesel fuel (DF) operation. Results indicate that the engine can run with 90% DTPO and 10% diesel fuel.     

地下装载机轮辋的选择与使用

简略地介绍了车轮的重要组成部分，轮辋的常用结构的选择和正确使用，安装与维护保养。     

对轮箍落锤试验的分析

分析了轮箍落锤试验并结合实际检测结果，论述了轮箍落锤试验的目的和意义，在此基础上，提出对目前轮箍落锤试验的意见。     

改性膨润土对轮胎半成品胶料性能影响的研究

在轮胎的内层胶、缓冲胶中加入5－10份改性膨润土，不影响轮胎半成品的力学性能，而且有助于改善胶料的加工性能，提高胶料与骨架材料的粘着强度。     

Measuring system for investigation of tri-axial stress distribution across the tyre-road contact patch

A measuring system for investigation of stress distributions in the tyre-road contact patch was designed and developed. The transducer within this system comprises a transversal array of sensing elements, covering the entire contact patch width in a single run. The system simultaneously measures stress distributions on three directions for a truck tyre (or even airplane tyre). Each sensing element has 10 mm × 10 mm contact surface and optimized dimensions, allowing measurements in various wheel rolling conditions. The transducer induces minimum changes in tyre-road contact properties, as it has very small gaps around sensing elements. The system is road mounted, in real rolling conditions. The measuring system contains 90 strain measuring channels. Main aspects regarding system calibration and specially developed software are illustrated. Preliminary results of tyre-road contact stress distributions are presented.     

Hydrogen production from the pyrolysis–gasification of waste tyres with a nickel/cerium catalyst

Hydrogen production from the pyrolysis-gasification of waste tyres has been investigated with a Ni/CeO₂/Al₂O₃ catalyst using a two-stage fixed bed reaction system. The conditions of catalyst preparation such as Ni and CeO₂ content and calcination temperature were investigated in relation to product yield and composition. The fresh and reacted catalysts were analysed using thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The results showed that there were small changes in the gas and hydrogen yield by adding 5 wt.% of CeO₂ into the Ni/CeO₂/Al₂O₃ catalyst. The gas yield related to the mass of waste tyre and the amount of reacted water were increased with the increase of CeO₂ content from 5 to 15 wt.%. However, with the further increase of CeO₂ content to 30 wt.%, the gas yield related to the mass of tyre and the amount of reacted water was reduced. Increasing the Ni content of the catalyst showed a positive influence on the gas yield and hydrogen production. The investigation of the calcination temperature of the Ni/CeO₂/Al₂O₃ catalyst showed that the oil yield related to the mass of tyre and reacted water decreased from 28.4 to 23.4 wt.% for the catalyst calcined at 500 °C, and decreased from 24.2 to 17.7 wt.% for the catalyst calcined at 750 °C. When the Ni content of the catalyst was increased from 5 to 20 wt.%. there were only small changes in total gas and hydrogen production from the pyrolysis-gasification of waste tyre. Lower coke deposition on the reacted catalyst was obtained for the Ni/CeO₂/Al₂O₃ catalyst prepared at the calcination temperature of 750 °C compared with the 500 °C calcination temperature.     

Production of hydrogen and hydrogen-rich syngas during thermal catalytic supported cracking of waste tyres in a bench-scale fixed bed reactor

There is much interest in producing hydrogen (H₂) and hydrogen carriers from various materials, including rubbery wastes to help in the fulfilment of the predicted H₂ economy. In this paper, simple and catalytic pyrolysis have been investigated for their suitability in producing gaseous fuels from waste tyres. Dihydrogen, alkane and alkene fuels production from tire wastes was carried out in a laboratory bench installation using a fixed bed reaction system at 500 °C and with a catalyst/waste ratio of 0.03. This last ratio is very low, which constitutes an interesting payoff in the plant costs. Investigations to valorise the three yielded by-products involved different combinations of four catalysts, three solid supports and three configurations of bed position. The results presented in this study concerned the gaseous phase, the yields of which varied from 17 to 32 wt%. The potential of H₂ production was significantly increased from 14 to 32 vol% by using MgO–based catalytic bed supported by a layer of oyster shells. It was also found that the low heating value of the pyrolytic gas was ameliorated from 10 to 44 MJ/Nm³. The yield of H₂S is focused on as it might increase the plant costs due to its relative post-treatment units.     

An experimental and numerical investigation on tyre impact

A key issue in the design of tyres is their capability to sustain intense impact loads. Hence, the development of a reliable experimental data basis is important, against which numerical models can be compared. Experimental data on tyre impact in the open literature is somewhat rare. In this article, a specially design rig was developed for tyre impact tests. It holds the test piece in a given position, allowing a drop mass with a round indenter to hit pressurised tyres with different impact energies. A high-speed camera and a laser velocimeter were used to track the impact event. From the laser measurement it was possible to obtain the impact force and the local indentation. A finite element study was then conducted using material properties from the open literature. By comparing the experimental measurements with the numerical results, it became evident that the model was capable of predicting the major features of the impact of a mass on a tyre. This model is therefore of value for the assessment of the performance of a tyre in extreme cases of mass impact.