Engine hood leading edge datum line marking device and use method thereof

Abstract

The invention provides an engine hood leading edge datum line marking device and a use method thereof. The engine hood leading edge datum line marking device comprises a straight ruler and a pen, wherein the length of the straight ruler is larger than or equal to 175mm, during marking, a first end of the straight ruler is aligned to and contacted with a reference line at an upper edge of a bumper of a vehicle, the pen is vertically arranged on the straight ruler, and the distance between an axis of the pen and the first end of the straight ruler is 175mm. During marking, the first end of the straight ruler is aligned to and contacted with the reference line at the upper edge of the bumper of the vehicle, the relationship between an engine hood leading edge datum line and the reference line at the upper edge of the bumper is determined, the distance between the axis of the pen and the first end is 175mm, when the straight ruler rotates to be tangent to the reference line at the upper edge of the bumper, the pen is moved to contact with the vehicle to form contact points, and a connection line of a plurality of the contact points forms the engine hood leading edge datum line. Under the condition that height and rotation angles are not defined, marking of the engine hood leading edge datum line of the vehicle can be achieved, and the structure is simple.

Description

technical field [0001] The invention relates to the technical field of pedestrian protection tests, in particular to a front edge reference line marking device of an engine hood and a use method thereof. Background technique [0002] The scribing method of the Bonnet leading edge reference line (BLE for short) in E-NCAP is: the geometric locus of the contact point between the straightedge 10 with a length of 1000mm and the front surface of the hood 11 . like figure 1 As shown, the geometric locus is formed by the contact points with the hood 11 when the straightedge 10 is parallel to the longitudinal vertical plane of the vehicle and inclined backward 50° from the vertical direction and the bottom end of the straightedge 10 is 600mm from the ground. In the pedestrian protection thigh impact test on the front edge of the hood, the following requirements are required: when the thigh impactor makes first contact with the front edge of the engine hood, the center line of the th...

AI Technical Summary

Problems solved by technology

[0003] From the above requirements, it can be known that the pedestrian protection thigh impact test area is mainly determined by the BLE line, and the accuracy of the mark directly affects the pedestrian protection thigh impact test results, and also affects the pedestrian protection safety performance. to develop

However, the marking method in E-NCAP is not applicable to all models, and has certain limitations, which also affects the accuracy of the BLE line

like figure 2 The marking frame 20 shown cannot meet the marking requirements of the BLE line for vehicles with a low front end height.

When the ruler 10 is close to the front end of the vehicle, the ground clearance of the bottom end of the ruler is already lower than 600 mm, so it cannot meet the marking requirement of 600 mm from the ground for all models, and the rotation angle of the rotation angle A of the existing device is limited, so that The distance between the ruler 10 and the front end of the vehicle is limited

The structure of marking frame 20 is complicated

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