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齿轮轮齿的弯曲强度,通常以齿根处为最弱。在计算该强度时,首先应确定出齿根所受弯矩为最大时,轮齿的啮合位置。若仅按弯曲力臂的大小来说,轮齿处在齿顶啮合位置时,弯曲力臂为最大。但是,由于齿轮传动的重合度ε_α。皆大于1,即当一对相啮合的轮齿处于齿顶啮合时,必定还有另一对齿处在啮合过程中。因此,这时应由两对齿轮共同分担载荷。显然,此时虽然弯曲力臂最大,而齿根所受的弯矩却不一定最大。对于制造精度较低的齿轮传动(如7.8.9等级精度)虽然理论上其重合度ε_α大于1,但是实际上由于制造误差,不可能两对齿平均分担载荷,从偏于安全考虑,按一对齿啮
Bending strength of gear teeth, usually at the root of the weakest. When calculating the strength, the tooth meshing position should be determined first when the bending moment to the tooth root is maximum. If only according to the size of the bending force arm, tooth gear in the tooth meshing position, the bending arm is the largest. However, due to the gear transmission coincidence ε_α. Are greater than 1, that is, when a pair of meshing teeth in the tooth top meshing, there must be another pair of teeth in the meshing process. Therefore, at this time two pairs of gears should share the load. Obviously, although the bending arm is the largest at this moment, the bending moment of the tooth root is not necessarily the largest. For the manufacture of low precision gear drive (such as 7.8.9 grade accuracy) Although the degree of coincidence ε_α theoretically greater than 1, but in fact due to manufacturing errors, it is impossible to share the load evenly between two pairs of teeth, from the partial safety considerations, according to one Pair of teeth