| The high-volume production of cylindrical gears is mainly concentrated on the area of the increasingly rapid development of automobile, tractor transmission. Generally, the accuracy of these gears is not required to be very high, but for the work life and noise and other performance there are a high requirement. In our country, the grinding technology has not an enough capacity to meet the requirements of mass production, because of the high cost for grinding machine. For the requirements meeting the high efficiency and the good technical process performance, based on the conceit of the lapping instead of grinding, there is a new method for self-adaptive mutual-lapping and mutual squeeze of cylindrical gears are firstly presented in this dissertation.The adaptive meshing of cylindrical gears is to make use of four gears driving one by one, which compose an closed loop system. Applied on the mutual-lapping and mutual squeeze of cylindrical gears is depending on the dynamic force the gear itself errors meshing creating to make the errors be equalized and disappear automatically, achieving a precision machining of gears. On the text, the analysis on the mechanism of self-adaptive mutual-lapping and mutual squeeze of cylindrical gears have firstly been done. the dynamic model for the mutual-lapping system have been set up based on the gear meshing dynamic theory, the solution and simulation of the dynamic equation have been achieved by the numeric method of fourth-order Runge-Kutta. Secondly, through the differential geometry and gear mesh principle, the analysis on the tooth surface sliding coefficients and the corrected ability of the self-adaptive mutual-lapping on each error fo gears have been done. The self-adaptive mutual-squeeze of cylindrical gears is based on the gears adaptive meshing, giving a pre-compressed force to gears under driving, depending on the pre-compressed force and the dynamic force by the error creating making the metal of tooth surfaces transform to amend the tooth errors. Using the material mechanics and the Hertzian contact mechanics gear load mechanics, the estimation on the pre-compressed force the tooth transform demanded during the gear queezing have been done. Finally, based on the change of the center distance of the gears, the design and manufacture of the self-adaptive meshing testing platform have been achieved. The experiments on the self-adaptive mutual-lapping and mutual squeeze of cylindrical gears have been done.These experiments show that the self-adaptive mutual-lapping of cylindrical gears and mutual squeeze could amend the gear errors some extent to make the gear precision improve and the gear meshing noise reduce, which has the definite practical value. |
