Glass lifter three-dimensional flexible assembly tolerance prediction method based on finite element

Abstract

The invention relates to a glass lifter three-dimensional flexible assembly tolerance prediction method based on a finite element, and the method comprises the steps: 1, building a glass lifter dynamic simulation analysis model, and obtaining a lifting load; 2, based on the extracted lifting load, calculating the rigidity expression of the vehicle door inner plate under the action of the load, andobtaining the deformation of the upper and lower mounting surfaces of the glass lifter; 3, reconstructing lifter mounting surface characteristics according to an obtained deformation result, and establishing a three-dimensional flexible assembly tolerance model of the glass lifter; and 4, defining the ratio of the out-of-tolerance rate reduction amplitude to the tolerance reduction as the yield ratio of the tolerance reduction, and taking the yield ratio as an evaluation index to realize the tolerance optimization design of the vehicle window lifting system. According to the method, the finite element and three-dimensional tolerance design combined method is adopted, the influence of lifting loads on the assembly relation is considered, the influence of sealing resistance and the rigidityof the vehicle door inner plate on the assembly state of the lifter is revealed, the assembly relation of the glass and the sealing strip is guaranteed by optimizing tolerance design, and the liftingsmoothness is improved.

Description

technical field [0001] The invention relates to the technical field of digital design and manufacture of automotive electric windows, in particular to a finite element-based three-dimensional flexible assembly tolerance prediction method for a glass regulator. Background technique [0002] Tolerance design is one of the important factors to determine product quality. Traditional mechanical product tolerance modeling is based on the assumption of rigid body. However, automotive body parts are assembled from sheet metal stampings through hierarchical welding, and the sheet material has greater flexibility. The deformation generated under the external load will directly affect the transmission and accumulation of assembly deviation, and ultimately affect the assembly accuracy and use function. [0003] The power window lifting system reflects the NVH performance of the door, and the smoothness of the window glass has a great impact on the quality evaluation of the whole vehicl...

AI Technical Summary

Problems solved by technology

Aiming at the uneven problems such as vibration, sticking and insufficient rigidity of the inner panel of the door during the lifting process of the window glass, the method of combining finite element and three-dimensional tolerance design is adopted, and the influence of the lifting load on the assembly relationship is considered, and the model including the deformation of the finite element is established. The three-dimensional assembly tolerance analysis model, which analyzes the key dimension tolerance transfer mechanism, clarifies the influence of lifting dynamic load, sealing resistance characteristics, glass lifting trajectory, assembly tolerance and fluctuation on lifting quality

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