Finite element model building and updating method of sprag clutch wedge block surface stress

Abstract

The invention relates to a finite element model building and updating method of sprag clutch wedge block surface stress. The building basis of the finite element model is that the wedge block is under the practical torsional load and wedge block lock state, the wedge, an inner ring and an outer ring are subjected to finite element meshing under the premise of ignoring the mutual effect of the inner and outer retainers and the spring on the wedge, then the finite element models of the wedge, the inner ring and the outer ring are built, and then an ANSYS software is adopted to judge the wedge block stress valve in the finite element model, if the valve meets the requirement, the building of the finite element model is reasonable, and if not, the wedge block geometry parameters namely the specific valve (design valve) should be revised according to the correction formula until the correction of the wedge block meets the finite element model. The final wedge block correction replaces the particular value of the wedge, the correction result improves the structure rigidity in the wedge block stress concentrated region, and the method can meet the requirements of practical torsional load, and further effectively improve the service life of the sprag clutch and save the practical experimentation cost.

Description

[0001] technical field [0002] The invention belongs to the technical field of clutches, and in particular relates to a method for establishing and correcting a finite element model of the surface stress of a sprag clutch wedge. Background technique [0003] The sprag clutch is a transmission part that can only transmit torque in one direction, and is widely used in aviation, ships, automobiles and other fields. [0004] combine figure 1 , the sprag clutch includes an inner ring 1, a certain number of sprags 2 and an outer ring 3, the sprags 2 and the outer ring 3 are limited by the outer cage 5, and the sprags 2 and the inner ring 1 are limited by the inner The position of the cage 4 is limited, and the coil spring 6 is sandwiched between the wedges. The outer contact surface of the wedge 2 is in contact with the raceway of the outer ring 3 , and the inner contact surface of the wedge 2 is in contact with the inner ring 1 . [0005] When the sprag clutch rotates in the...

AI Technical Summary

Problems solved by technology

[0008] The existing wedge geometry parameter design method is designed based on experience, which requires a large amount of test data to test the performance of the sprag clutch, and lacks an effective analysis method to obtain the specific stress and deformation of the local weak area on the wedge surface , which brings a certain degree of difficulty to changing the geometric parameters of the wedge and calibration or improvement work, and brings certain difficulties to the difficulty of changing the geometric parameters of the wedge and the processing cost through experiments

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