Novel oil filling pipe dimension chain calculation method

Abstract

The invention discloses a novel oil filling pipe dimension chain calculation method comprising the following steps: obtaining dimension design parameters of an oil filling pipe port of a to-be-measured vehicle model, and establishing a three-dimensional coordinate system XYZ; the method comprises the following steps of: finding out motion trails of all dimensional tolerances which influence the deviation of the oil filling pipe orifice and are equivalent to points, making the motion trails of all the points in CATIA software, projecting the motion trails into an XYZ coordinate system to obtain projection lengths of all the tolerances on the center point of the oil filling pipe orifice in the XYZ direction, and respectively solving the sum of squares to obtain the deviation of the oil filling pipe orifice. Performing root-mean-square calculation to obtain the deviation of the center point of the oil filling pipe opening in the X, Y and Z directions; dividing the sum of squares obtained by the projection lengths of the center point of the oil filling pipe opening in the X, Y and Z directions of each tolerance by the total sum of squares to obtain the proportion of the center deviation of the oil filling pipe opening by each tolerance, thereby guiding the size design of the oil filling pipe opening of the vehicle type to be measured. Therefore, researchers can conveniently control the deviation of the oil filling pipe in the designing and manufacturing process.

Description

technical field [0001] The invention relates to the technical field of calculation of the size chain of an automobile fueling pipe, in particular, discloses a method for calculating the size chain of a novel fueling pipe. Background technique [0002] In the existing automobile market, customers have higher and higher requirements for the appearance of the car, and many models use the gas filler pipe and rubber interference to waterproof the gas filler. The error is large, and it is easy to be eccentric. The rubber fitting of the filler pipe and the filler box only relies on the interference of the rubber itself to prevent water, and there is a possibility of clearance fit. In order to solve the problem of water leakage, the calculation of the dimension chain of the fuel pipe assembly and the body is particularly important. SUMMARY OF THE INVENTION [0003] The purpose of the present invention is to overcome the defects of the prior art, and propose a new method for calcu...

AI Technical Summary

Problems solved by technology

[0002] Customers in the existing automobile market have higher and higher requirements for the appearance of the car. Many models use the oil filler pipe and rubber interference fit to waterproof the fuel filler port. The error is large, and it is easy to be eccentric. The rubber fit between the fuel pipe and the fuel filler box only relies on the interference of the rubber itself to prevent water, and there is a possibility of clearance fit. In order to solve the problem of water leakage, it is particularly important to calculate the dimensional chain of the fuel pipe assembly and the body.

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