Zhang Junfu

The study and analysis of a new Anti-backlash worm gear

In this paper, a new kind of the anti-backlash double-roller enveloping hourglass worm (ADEHW) with line contact between intersecting axes has been studied by means of the theory of gearing and the space engagement theory for the first time. The engagement equation and tooth profile equation have been derived by applying the theory of gearing. Meanwhile the important factors that impact the performances of the worm were numerical calculated analysis. Based on the developed mathematical model of the Anti-backlash Double-roller Enveloping Hourglass worm, computer graph of the gear set has been designed by applying Pro/Engineering. The study results show that the new kind of Anti-backlash worm gearing has the advantage of big carrying capacity and high efficiency, The most important is that can solve the problem of Anti-backlash on the worm gear.

Contact Finite Element Analysis of Anti-backlash Double-roller-Enveloping Hourglass Worm Gearing

The anti-backlash double-roller-enveloping hourglass worm gearing is multi-tooth meshing transmission and it has complex tooth profile. It is difficult to obtain the load distribution among the meshing tooth pairs and the stress distribution along contact line with analytical model. So, based on the geometrical model of the anti-backlash double-roller-enveloping hourglass worm gearing, the Finite Element Method is used to analyze its load capability. The contact finite element model of this kind of worm gearing is created with 10-node tetrahedral element Solide92 and face to face contact mode. Using the nonlinear contact module of ANSYS software, the contact finite element model is solved with the large displacement static deformation mode. The results show that the load distributions among the meshing tooth under the different conditions are uneven. And the stress distribution along every contact line takes on an obviously descent trend from the addendum to the dedendum of worm wheel.

Tooth contact parameters analysis of the non-backlash double-roller enveloping hourglass worm gearing

The tooth contact parameters such as lubrication angle, induced normal curvature, entrainment velocity, et al. of the nonbacklash double-roller enveloping hourglass worm gearing and influencing factors are studied systematically. The averages of the lubrication angle, the induced normal curvature, the entrainment velocity and the rollers rotation angle which located on a number of mesh lines are taken as meshing performance index. Based on numerical computation, the influences of the roller radius, the roller installation offset distance, the throat diameter coefficient and the drive center distance on the tooth contact parameters of the non-backlash double-roller enveloping hourglass worm gearing are described by using the contours. The results show that a superior performance worm gear can be obtained by choosing rationally geometry parameters when the center distance is between 250~450mm.

Designing of autonomous humanoid robot soccer system

Robots can be as flexible and smart as human beings, which has been the dream of a number of scientists and science fiction writers. The emergence of humanoid robots and the research of artificial intelligence and related technologies are the major step to realize the dream. This paper presents a framework design of autonomous humanoid robot soccer system based on the analysis of autonomous humanoid robot soccer system. We designed the control system of upper machine and lower machine, the upper and lower machine communicating via Bluetooth, processed the original image using the Kalman filtering algorithm, and proposed a four step reasoning model based on the six step reasoning model. Large number of experiments shows that the robot soccer system has good stability and strong competition ability.