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Precautions for installing gas springs for vehicles

Update:15-11-2019
Summary:

The components are generally installed in the back door […]

The components are generally installed in the back door of the car, mainly to assist the car to open or close the door, but in the process of installation, some aspects need to be considered, and the installation cannot be performed blindly. What are the precautions for the specific installation of the gas spring process? What? The analysis is as follows.
1. Confirm the center position of the hinge of the back door hinge
The data that has been completed should be verified before the back door is installed. It must be confirmed whether the two hinges of the back door are coaxial; whether the back door is in interference with the surrounding body during the whole process of rotating along the hinge axis; whether the installation space of the component is sufficiently reserved.
2. Determine the total mass of the back door and the position of the center of mass
The total mass of the back door is the sum of the masses of the components consisting of metal and non-metal materials. Including the back door gilt, the back door glass, the rear wiper system, the license plate light and the decorative panel, the rear license plate, the back door lock and the back door trim panel. Under the premise of knowing the density of components, the weight and centroid coordinate points can be automatically calculated using CATIA's measurement inertia command.
3. Determine the position of the component on the back door mounting point
The mounting point here theoretically refers to the center of rotation of the ball ends at both ends of the component. In the installation, the piston is generally above and the piston rod is below. The connection to the inner panel of the door must be made by a bracket mounted on the inner panel of the rear door to allow the outer diameter of the piston and the space for movement. On the inner side of the inner panel of the door, there must be a reinforced nut plate for mounting the gas spring bracket. The strength of the rear door nut plate and the bracket and the rigidity of the back door must meet the requirements of the maximum force condition.
4. Determine the opening angle of the back door
The opening of the back door is determined based on an ergonomic analysis. At present, there is no regulation on the height of the ground from the back door to the maximum position of the lower edge of the door. According to the convenience of people standing on the ground, when the general design is opened to the maximum position, the lowest point of the lower part of the back door should be about 1800mm from the ground to determine the opening angle of the back door. This design is based on the fact that it is necessary to consider that the person's head does not easily touch the lower point of the lower part of the back door, and that the hand can easily reach the handle when the door is closed. Due to the difference in height and structure of the body, the opening angle of the back door of each model is also different, which is roughly between 100° and 110° from the vertical direction. At the same time, the maximum opening angle of the back door should be less than the maximum opening angle that the hinge can reach; the gas spring runs to the end of the stroke and has a buffer mechanism to avoid damage of the components.