Papers by Keyword: Tooth Profile Modification

Abstract: Dual meshing silent chain mechanism can reduce the polygon action. In order to realize the conjugate meshing, the sprocket of the dual meshing silent chain mechanism is supposed to be an involute sprocket with a large pressure angle and negative modifying coefficient. Through the investigation on the transmission progress of dual meshing silent chain mechanism, the movement trajectory of the chain link and the sprocket is achieved. The inside tooth profile of link is interfered with the hypothetical sprocket tooth profile. So the supposed involute sprocket is modified. The result shows that the sprocket with the conjugate meshing and no interference is the addendum modifying sprocket with a large pressure angle and a large negative modifying coefficient.

Abstract: The development status of profile modification technology and slotting process are described, the paper proposed slotting profile modification process, in view of the advantages of slotting processing. The modification curve of modification gear is fitted in the form of multi-segment involutes by resembling the principle of tooth profile modification on the grinding machine by using generating principles and changing the pressure angle, the formula of modification pressure angles of slotting cutter corresponding sections of involutes deduced,the modification profile of slotting cutter is designed.

Abstract: The quasi-static contact finite element analysis of meshing gear of gear-box is computed by using MSC.Marc software, then transmission error and surface contact stress of meshing gear are computed in different tooth profile modification methods. Due to the large load fluctuation of tracklayer, the target of tooth profile modification is suggested, which is to minimize the peak value of tooth contact stress to the full, and not to increase the transmission error fluctuation of gear system.

Abstract: Gear tooth profile modification can be featured to improve working stability of gear equipments, abate noise and vibration, enhance loading ability and prolong usage life of the gears. Fine forged spur bevel gear are formed with molds, so it is economical to modify the gears by means of modifying mold cavity. Whether the modified gears can be separated from the mold with easiness is proposed to be the basic criterion of gear tooth profile modification design. Near the big ends and tooth roots is mainly the area which affects demolding after modification. According to the modified gear configuration, mathematical model is built to calculate the demolding check at any modification points on the fine forged spur bevel gear profile. And a corresponding program is developed, which is the main tool for the gear tooth profile modification design, and practical calculation has carried out.

Abstract: After using plated CBN hard gear-honing-tools with standard involute tooth profiles, there will be the middle concave errors generally around pitch circle on the machined gear tooth surfaces. For the factors caused to errors are much complicated, it is difficult to calculate them accurately by the analytic method. Therefore, Using Pro/E and ANSYS software, the engaging situation between gear-honing-tool and gear was simulated and analyzed. Based on the results of the analysis, the abrupt changing extent of the compression stress was determined near pitch circle. Along the number of the machined gear teeth was changed, the abrupt changing extent of the compression stress was varied accordingly, which was also coincided with the middle concave errors. Those provided the theoretical foundation for the tooth profile modification of the hard gear-honing-tools, it was proved useful to reduce or eliminate middle concave error in practice.

Abstract: Using plated CBN hard honing wheels with standard involute tooth profiles, there will be the middle concave error around pitch circle on the machined gear tooth surfaces. Therefore, standard involute tooth profiles of honing wheels have to be modified properly before electroplating CBN. In the paper, aiming at the tooth profile modification of honing wheels, the standard involute curve was converted into a spline curve, and control points of the spline curve were parameterized in solid modeling of honing wheels. By the Pro/E and ANSYS Workbench software, the engaging situation between honing wheel and gear was analyzed. Based on the analysis results, assuming the control points around pitch circle were set as variable parameter, and basically equal contact pressures were set as response variable parameter, the tooth surfaces of hard honing wheels were properly corrected, it was proved useful to reduce or eliminate middle concave error in practice.

Abstract: The gear design always be focus on analyzing the static performance (strength, stress, friction) and dynamic performance (inertia, noise, vibration), and especially for dynamic, the noise and vibration of gear are big problems. Actually, the main reason of noise and vibration is transmission error between master and slave gears, but the error must exist in any manufacture process. To decrease harmful noise and vibration, the most effective method is “tooth profile modification”, which is by tip relief or root relief for modifying geometry profile of gear tooth to regulate transmission error. In the paper, the transmission error of original model and modified model will be compared to show the gear profile modification will influence the transmission error obviously.