Study On Meshing Analysis And Meshing Control Of Double-enveloping Hourglass Worm-gearing Affected By Misalignment Errors And Load-dependent Deformation

The double-enveloping hourglass worm gearing is one kind of mechanical transmission drivers, which is developed by China and Japan firstly and is used widely in national defense and civil producing industries. Compared to other mechanical transmission drivers, advantages of the double-enveloping hourglass worm gearing are high load capacity, high transmission efficiency and the worm tooth surface manufactured by grinding. Due to the multi-tooth line contact of double-enveloping hourglass worm gearing, it is very sensitive to misalignment errors and load-dependent deformation existing in the practical meshing condition. The double-enveloping hourglass worm gearing based on classical meshing theory does not conjugate well because of misalignment errors and load-dependent deformation. Aiming at the key problems arising from the meshing analysis and meshing control of the double-enveloping hourglass worm gearing affected by the misalignment errors and load-dependent deformation, thorough theoretical analysis and experimental study are carried out.The direct digital design method is applied to the solid modeling process of the double-enveloping hourglass worm gearing, which simulates the practical manufacturing process. The solid model of the double-enveloping hourglass worm gearing is achieved by the Boolean operation, which is different from the conventional solid modeling method. The characteristic of direct digital design method is that it could adapt to the geometry parameters variation of the worm-gearing rapidly and could meet the requirements of the tooth modification. The misalignment errors could be included easily in the solid model of the worm-gearing by the direct digital design method, which is extremely important to the study of misalignment errors, loaded meshing analysis, tooth modification and meshing control in practical meshing condition.Combined influence of misalignment errors and load-dependent deformation is under consideration in the Loaded Tooth Contact Analysis method (LTCA) of the double-enveloping hourglass worm gearing, in which the contact zone and contact pattern are not predesigned before contact solving process. In the iteration process, there are two iterative loops, i.e. the outer contact pattern loop and the inner contact force loop, through which the contact zone and contact stress could be obtained more exactly. The influence of various misalignment errors and load-dependent deformation on the...