Passenger car body-in-white bending and torsion stiffness test restraint device

Abstract

The invention provides a passenger car body-in-white bending and torsion stiffness test restraint device which includes a workbench, a torsion crossbeam, a first column, a second column, a third column, and a fourth column. The torsion crossbeam is horizontally arranged on one side of the workbench via a support, and can rotate horizontally around the support. The lower end of the first column and the lower end of the second column are arranged on the two sides of the torsion crossbeam respectively. The lower end of the third column and the lower end of the fourth column are arranged on the other side of the workbench at an interval. The top end of each column is provided with a connecting member which limits three mobile degrees of freedom but does not limit three rotational degrees of freedom. The lower end of the third column or the lower end of the fourth column is fixed on the workbench, and among the connecting members between the lower ends of the remaining three columns and the workbench or the torsion crossbeam, one is a unidirectional rotary hinge, and the other two are connecting members which limit three mobile degrees of freedom but does not limit three rotational degrees of freedom. In such a manner, the six degrees of freedom of the car body space are restrained, the influence of a frame to the car body stiffness is eliminated, and the car body posture can be easily adjusted.

Description

technical field [0001] The invention relates to the technical field of vehicle detection, in particular to a restraint device for a bending and torsional rigidity test of a body-in-white of a passenger car. Background technique [0002] Body in White refers to the body before welding but not painted, excluding moving parts such as doors and hoods. Body-in-white plus interior and exterior decoration (including instrument panel, steering column, seat, front and rear windshield, rearview mirror, fender, water tank, headlight, carpet, interior guard, etc.) and door, hood , trunk lid and electronic and electrical systems constitute the body in the true sense, which is called trimmed body in the industry, that is, the assembled body, and on this basis, the chassis (including engine, gearbox, transmission system, braking system, Suspension system, exhaust system, etc.) make up the whole vehicle. [0003] Bending stiffness and torsional stiffness are one of the important propertie...

AI Technical Summary

Problems solved by technology

[0018] a) It does not meet the constraint requirements of the degree of freedom of the space mechanism, and introduces constraints beyond the six degrees of freedom of the body, which will generate preload when the body is installed and fixed; each stage of body development needs to test the stiffness value, and the over-constraint Due to the different sizes of preloads generated during the clamping process of the type device, it is bound to reduce the comparability of the stiffness values ​​measured at each stage

[0019] b) Too many constraints limit the deformation of the body during loading, making the measured body stiffness value larger

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