共查询到20条相似文献，搜索用时 15 毫秒
1.
Long Hui Zhang Guanghui 《保鲜与加工》1993,(1):102-106
By using the finite element elastic contact analysis method combined with the I-DEAS engineering analysis software, this paper studies the strength of the cone roller enveloping worm gearing,which is a new type of worm gearing transmission,on SUN-4 working station. It also analyzes loading distribution among meshing gears, the contact force distribution along the contact line ,the bending stress distribution and the contact stress distribution of the cone roller enveloping worm gearing with three-tooth meshing instantaneously. Besides,it provides the theoretic basis in the further researches for the new type of worm gearing transmission. 相似文献
2.
A method to make the hourglass worm gearing with the property of mismatchedpoint contact has been proposed.The worm and the hob of the worm gearing is generated by a coneand a straight line located on the cone respectively. The basic principle of the worm gearing has beenanalysed. The formulas for calcultating the machining parameters has been obtained. And the toothcontact of the worm gearing has been investigated.The result shows that this worm gearing could getopint contact well. 相似文献
3.
The contact analysis on the double enveloping hourglass worm gearing is very important to control its efficient contact zone and contact quality. Nevertheless, current meshing analysis under the rigid condition cannot really reflect its tooth-surface contact. In this paper, the contact Finite Element Method is used to analyze the tooth contact of double enveloping hourglass worm gearing under the manufacturing error and the elastic deformation caused by the load. The load sharing among the contact tooth pairs and variations of contact zone are investigated. As compared with the result of rigid analysis, the contact zone is obviously shifted. This analysis method can provide a base for the conjugating control of the double enveloping hourglass worm gearing. 相似文献
4.
A new worm driving,i.e. planar internal gear enveloping crown worm driving,is presented. Its mathematical model of meshing functions and teeth surface equations are established basing on the theory of differential geometry and gear mesh. Various types of the driving,the macroscopic meshing performance and the microcosmic meshing performance are analyzed. The results show that the inclination angle of generating plane determines the distribution of contact lines,the planar internal gear primary-enveloping crown worm driving has ideal lubrication property,and the planar internal gear second-enveloping crown worm driving has high loading capacity. The studies are practicably instructive for developing new worm driving with high loading capacity,ideal lubrication and small volume. 相似文献
5.
Qin Datong Zhang Guanghui 《保鲜与加工》1993,(1):7-13
A method of modifying the double enveloping worm gearing with developable tooth surface has been proposed to reduce the sensibility of the worm gearing to the manufacturing errors. The tooth contact and kinematic precision of the modified worm gearing with manufacturing errors has been investigated by the TCA method. The results show that by the modification, the edge contact resulting from the manufacturing errors is avoided or effectively relieved,and the kinematic error of the worm gearing is obviously reduced. 相似文献
6.
Qin Dongxing Qin Datong Shi Wankai 《保鲜与加工》1998,(4):79-83
Based on the theory of conjugate surface and computer graphics, a solid modeling method of hourglass worm gearing is presented. Assembly simulation of worm gearing is carried out, clearance and interference between meshing tooth surfaces are analyzed, and effects of machining and modification of assembling parameters on meshing and contact between tooth surfaces are investigated. 相似文献
7.
A methed to modify the cone-generated cylindric worm gearing(ZK-Wormgearing)with the proprty of controllable mismatched contact has been proposed.The basic principleof the modification has been analysed.The contact state of the worm gearing could be modified bychanging the contact position and the curvature modification amount,which could be realized conveniently by changing the geometric parameter and the setting parameter of the grind wheel in wormmachining. 相似文献
8.
Wang Jinge Zhang Ganghui 《保鲜与加工》1992,(2):58-64
In this paper, a new high - strength worm gearing, named'rolling cone enveloping hourglass worm gearing' is proposed. With such a new type of worm gearing, the motion form between meshing tooth surfaces is changed in nature. A systematic theoretical study. a lot of numerical calculations and parameter analyses have been done. Based on these analyses,the optimum design of worm gearing is obtained. It is shown that this worm gearing possesses the virtues of high efficiency, large load capacity, long life -span and easy meanufacture. 相似文献
9.
With the Contact Finite Element Method, the distribution and contact zone of the hourglass worm gearing are calculated. Under the different loads, load among the teeth pairs and variation of contact zone are investigated. The photo elastic experiment has been proceeded for verifying the pressure distribution and load sharing. The result by photo elastic experiment is corresponding to the calculating result with contact FEM. 相似文献
10.
In the paper,a new worm gearing,Ball worm gearing is presented,initiative discussion of its theory of the gearing and design have been done, made a junior advanced development. 相似文献
11.
Tan Jianping Zhang Guanghui 《保鲜与加工》1988,(1)
On the condition of avoiding the"undercutting,"and "sharpening" of worm tooth, it is now regarded as an important subject in the field of meshing principle studying of the "multiple-thread small reducation ratio" hourglass worm gearing with developable tooth surfaces to reduce the gorge pitch circle diameter of worm, raise meshing efficiency and strength of the wheel tooth and improve the unresonable structure of the pair. In this paper, a new type of hourglass worm gearing with developable tooth surfaces -"Sphere Re-nveloping Hourglass Worm Gearing" is studied. It shows that 4a satisfied result to above subject can be obtained if this worm gearing is applied. 相似文献
12.
Qin Datong Zhang Guanghui 《保鲜与加工》1993,(1):45-51
The tooth contact and kinematic precision of cone-generated double-enveloping worm gearing with machining and assembling errors have been investigated. The influence of different errors on driving quality has been discussed. The assembling method to reduce or eliminate the influences of machining errors on tooth contact and kinematic precision has been proposed. 相似文献
13.
This paper develops a generalized 3-dimensional 14-DOF dynamic model for hypoid gear which considers the time-varying friction coefficient and lubrication situation. We propose a mixed elastohydrodynamic lubrication(EHL) friction model of hypoid gear tooth contact to reflect the realistic lubricant situation in gear transmission system consisted of full film contact and asperity contact. Under the mixed lubrication condition, the effects of time-varying friction coefficient on gear dynamic is analyzed. The load sharing coefficient is used to calculate the instantaneous friction coefficient at each contact point along the contact path. Friction coefficient model based on mixed elastohydrodynamic lubrication(Mixed EHL) is incorporated into the dynamic model to predict the dynamic mesh force and transmission error with constant and time-varying friction coefficient. The simulation results under a wide range of speed and load show that the time-varying friction coefficient has a marginal effect on the dynamic response. 相似文献
14.
Based on study of elastohydrodynamic lubrication (EHD) and meshing theory of planar worm gear drive, EHD model for the drive is proposed. Minimum film thickness on the whole contact area is calculated. EHD status for the drive is analyzed. The distributions of film thickness show that, EHD status during entry engagement is better than that during exit engagement, and EHD status of worm addendum area is better than that of dedendum area. Influencing factors such as work conditions and optimized parameters along with their effects were analyzed. Theoretical analysis suggests that the optimizing pressure angle and increasing worm pitch diameter have influence on improving lubricant performance of the planar worm gear drive. 相似文献
15.
Based on the spatial gearing theory, the mathematical model for working pitch cone design of crossed beveloid gears is created. The formulas to determine the transition from point contact to line contact are derived. The direct and in direct methods for pitch cone design of crossed beveloid gears are proposed. The effects of gearing parameters on the angle between the first principle directions are analyzed. The loaded tooth contact analysis is performed using FEM theory. The conclusion indicates that: the angle between the first principle directions is more sensitive to cone angles than to the helix angle. The increase of the angle between the first principle directions can obtain smaller contact area, higher transmission error and lower mesh stiffness. A practical tooth bearing test is conducted to demonstrate the proposed design procedure and the experimental result compared well with the simulation. For the matching design and optimization of beveloid gears, it has both the theoretical and project practical significance. 相似文献
16.
Electromechanical coupling experimental analysis of permanent magnet AC servo precision drive system
To research the dynamic characteristics of the permanent magnet AC servo precision drive system coupled with multi-factors, the experiment system is constructed with PMAC as the core and IPC as the support platform. Through software prototype system, response signals such as the current, speed and torque are acquired when the system is in the no-load and in the loading operating state, then the theoretical analysis results are compared with the experimental results. So the experiment validates that the electromechanical coupling analysis of the system is correct. This research helps to analyze the influence mechanism and law that the design parameters and electromechanical coupling parameters exerted on the system performance. At the same time, the research is beneficial for dynamic design of the permanent magnet AC servo precision drive system. 相似文献
17.
为揭示机体弹性变形对曲轴主轴承润滑特性的影响,在考虑整机体和曲轴弹性的条件下,建立发动机曲柄连杆机构多柔体动力学模型,耦合基于质量守恒边界条件的广义雷诺方程和Greenwood/Tripp接触模型,分析机体弹性变形对曲轴主轴承润滑特性的影响。结果表明：与刚性机体相比,计入机体弹性变形后,各主轴承的润滑特性随曲轴转角的变化趋势与将缸体处理为刚性时基本一致;润滑油平均端泄量和总摩擦功耗在一个工作循环内均变化较小;润滑油最小油膜厚度、最大油膜压力和轴承的最大粗糙接触压力在一个工作循环内的某些时刻变化明显。 相似文献
18.
Although rolling lubrication can decrease rolling forces and energy consumption, it also causes defects such as uneven flange lateral spread and web eccentricity during H-beam rolling process. To solve the problem caused by lubrication, finite element models of H-beam universal rolling were established. The different friction conditions of the contact surface between the rollers and work piece were simulated individually. The mechanism of rolling lubrication impacting on flange spread was studied, and the law of flange lateral spread was gained by analyzing the factors such as friction distribution and metal flow in different situations. Analytical results show that lubrication in rolling process can effectively decrease rolling forces and energy consumption. In the condition that technological parameters except friction are fixed, the flange lateral spread decreases in a linear way as the friction coefficient between flange and roller increases, and the flange lateral spread is more sensitive to the friction of flange's the inner side. Design of lubrication process should take full account of the sensitiveness differences of flange lateral spread to the lubrication conditions of different parts of roller surface. 相似文献
19.
Though speed effect and tension effect are keys to controlling thickness in producing aluminum foil, sort of their mathematical models, which will be widely used, can't be obtained theoretically at present. Based on the study of aluminum foil rolling in some factory, speed effect and tension effect of some 1850 aluminum foil mill are analyzed, and mathematical models which are about the relation between the exit thickness of aluminum foil and the speed change and the tension change, are developed according to the attained trial data. Those models are used to optimize the process of this mill. 相似文献
20.
作物水氮耦合效应的研究进展 总被引：1，自引：0，他引：1
为了解现阶段作物水氮耦合效应研究进展，给之后深入研究水氮耦合效应机制提供理论基础，本文总结了水氮耦合效应对土壤物理性状、营养元素在土壤中的有效性、土壤酶活性、光合性能、生理代谢、植株地上及地下部分生长发育及产质量等方面的影响，并指出了现阶段水氮耦合效应研究存在的不足，包括水氮耦合受生态环境的影响、水氮利用效率差异机制、水氮调控生理及分子机制，以及水氮耦合高效管理模型等方面均有待于进一步深入研究，同时对今后在本领域的研究工作进行了展望，以期为日后加强节水节肥技术的应用提供参考。 相似文献