点线啮合齿轮参数选择的封闭图

CLOSED PICTURE OF POINT-LINE GEAR PARAMETER SELECTION

点线啮合齿轮传动是一种新型的齿轮传动,在设计时其参数选择与渐开线齿轮不同,渐开线齿轮的封闭图不能应用于点线啮合齿轮。点线啮合齿轮的封闭图与齿数z1、z2及刀具参数有关,而与中心距a及模数mn无关。封闭图主要确定大齿轮变位系数x2与螺旋角β,这样就相应地确定了其他参数。叙述了曲线的意义,选择不同的x2与β就可以得到不同的齿形、啮合角、全齿高以及啮合性质等。还叙述了点线啮合齿轮的特点,以及在相同z1、z2下,不同刀具参数时的变态图形以及它们的特点。

Point-line meshing gear is a new kind of geartransmission. The selections of parameters between point-line meshing gear and involuted gear are different while designed. The closed picture of involuted gear can not be applied to that of the point-line meshing gear. The closed picture of point-line meshing gear relates to the number of teeth z1, z2 and the tool parameters, but it doesn't relate to center distance a and modulus mn. The big gear's coefficient factor x2 and helix angle β are chiefly decided by the closed picture, and other parameters are accordingly decided then. It illustrates the meanings of curvesof the closed picture. It also illustrates that by designing different x2 and β the bears with different tooth profile, meshing angles, whole depths as well as the characters of meshing etc will be got. It also mentions the characteristics of point-line meshing gear and the abnormal graphs as well as their characteristics while choosing different tool's parameters with the sameness z1