慢变刚度对渐开线直齿轮振动的影响

由于齿轮刚度的时变性,传动齿轮的振动具有非线性振动的性质.本文研究了齿轮单齿啮合区和双齿啮合区非线性振动解和线性振动近似解之间的差异.发现不论是在额定载荷激励下,还是在加工误差激励下,两者的差异均较小.所以将啮合刚度在单齿啮合区内或双齿啮合区内作定值处理是满足工程要求的.     

塑料齿轮轮齿疲劳折断机理初析

对塑料齿轮疲劳破坏过程作了讨论和分析，提出了疲劳裂纹的萌生与扩展的银纹模式，认为轮齿表面节点附近热拉伸内应力是导致银纹形成的重要原因。     

Fracture characteristics of steering gear sector shafts

The sector shaft is a critical component of an automotive power assisted recirculating ball steering gear and one that is vulnerable to fracture due to loads transmitted through the steering linkage under certain conditions. This paper describes conditions under which such fractures can occur and the characteristics that distinguish the most frequently observed fractures.     

螺旋锥齿轮的根线倾斜

指出了螺旋锥齿轮根线倾斜的意义与卡特波彼勒工程机械用螺旋锥齿轮根线倾斜的原则，并推导出根线绕中点倾斜时的计算方法。     

Rigid-elastic modeling of meshing gear wheels in multibody systems

In many applications in mechanical engineering, gear wheels are used to transmit power between rotating shafts and, therefore, the ability to incorporate them into multibody systems and to simulate contact between them has become an essential topic in multibody dynamics.However, in some applications gear wheels may not be considered as being perfectly rigid. Due to the effect of contact forces there occur relevant deformations in meshing teeth and it is required for a high quality of the analysis to introduce some elasticities in the model of meshing gear wheels. Therefore, in this work elastic elements between the teeth and the body of each gear wheel are considered. This approach is especially well suited for multibody systems since it is a compromise between a totally rigid model and a fully elastic model allowing the simulation of large motions with many revolutions while still important elasticities are considered. The teeth and the body of each gear wheel are still modelled as being rigid but they are connected to each other by elastic elements. In doing so, an efficient and physically motivated algorithm is described and implemented in order to find the effects of multi-tooth contact as well as backlash and left and right hand side contact of the meshing teeth. Some examples compare the simulation results of rigid, partially elastic and fully elastic models.     

Über die Beanspruchung oberflächennaher Werkstoffbereiche von Zahnflanken bei Voll‐ und Mangelschmierung

Strengthening of surface‐near‐materials‐zones of gear flanks with plain and deficient lubrication Couplings of gears, as strengthened over long duration, show often ruptures on the flanks. Their distribution and orientation among the surface can be explained by the kinematics of rolling. The cracks show an angle inclined towards the surface between 20 ° and 40 °. They are opposite to the occurring tangential stresses. Only in negative slip zones the ruptures grow to secondary cracks, rupturing occurs mainly at this point. The commonly used calculation of the materials strengthening in surface near zones by the HERTZian distressing conditions applied for tangential stresses does not give any hint to a preferred area of the flank stressed with negatives slip. The various failure phenomena can be explained by the elastohydrodynamic (EHD) – hypothesis. This hypothesis points out that the lubricants flow causes additional strengthening which influences the fatigue endurance and lowers the value determined after HERTZ.     

自动变速器换档的神经网络控制系统设计

将多层前向神经网络应用于AMT自动变速器中.介绍了神经网络在最佳档位决策方面的训练过程.根据大量的经验值离线训练BP网络的权值,最终使网络迭到要求的精度.     

螺旋伞齿轮闭式精锻新工艺

针对螺旋伞齿轮开式模锻存在的问题，提出了螺旋伞齿轮闭式精锻新工艺及其模具结构。工艺试验表明，新工艺可显著降低锻压变形力、材料消耗和生产成本，提高模具寿命和生产效率。     

非对称混合公比变速系统设计规律的探讨

讨论了非对称混合公比变速系统中基本组传动副数及第一扩大组级比指数的确定问题，给出了非对称混合公比变速系统的设计规律。     

新型糖果包装机推糖机构设计

目的设计一种新型糖果包装机的推糖机构,更好地满足糖果包装过程中的工艺要求。方法采用傅里叶非圆齿轮周转轮系实现糖果包装机推糖机构的工作轨迹,并建立傅里叶非圆齿周转轮系推糖机构的数学模型;根据糖果包装过程中具体的推糖工艺要求,采用Matlab语言编写该机构的辅助设计软件,并通过该软件选取满足要求的机构参数。结果通过实例计算可知,傅里叶非圆齿轮周转轮系能够实现推糖机构的工作轨迹,具有直线推糖行程长度136.8 mm,且推杆在行程最左段能快速地退出。结论傅里叶非圆齿轮周转轮系能够很好地实现推糖机构工作轨迹,完成糖果包装的工艺要求。