Analysis and Optimization of the Hinge Mechanism of the Trunk Lid_Hinge Knowledge_Tallsen

Currently, the hinge transmission system used in car trunks is designed for manual switch trunks, which requires physical force to open and close the trunk. This process is labor-intensive and poses a challenge in the electrification of trunk lids. The goal is to maintain the original trunk movement and position relationship while reducing the torque required for electric drive. Traditional design calculations are insufficient for providing accurate data to optimize the trunk mechanism. Therefore, dynamic simulation of the mechanism is essential to obtain accurate motion states and forces, enabling a reasonable mechanism design.

Dynamic Simulation in Mechanism Design:

Dynamic simulation has been successfully applied in the design of various automobile mechanisms, such as articulated dump trucks, scissor doors, door hinges, and trunk lid layouts. These studies have demonstrated the feasibility and effectiveness of using dynamic simulation to improve automotive linkage mechanisms. By simulating the manual and electric opening forces, the mechanism design can be optimized based on accurate and comprehensive data, ensuring a smooth transition to the electrification of trunk lids.

Adams Simulation Modeling:

In order to perform dynamic simulations, an Adams model is established using computer-aided 3D interactive application software (CAIA). The model consists of 13 geometric bodies including the trunk lid, hinge bases, rods, struts, connecting rods, pull rods, crank, and reducer components. The model is imported into the automatic dynamic analysis system (Adams) where boundary conditions, model properties, and gas spring force application are defined. The gas spring force is determined based on experimental stiffness parameters and a spline curve is established to simulate its behavior. This modeling process allows for accurate simulation and analysis of the trunk mechanism.

Simulation and Verification:

The Adams model is used to analyze the manual and electric opening modes separately. Incremental forces are applied at the designated force points and the trunk lid opening angles are recorded. The analysis reveals that a minimum force of 72N is required for manual opening and 630N for electric opening. These results are verified through experiments using push-pull force gauges, which show close agreement with the simulation results. This demonstrates the accuracy and reliability of the dynamic simulation method.

Mechanism Optimization:

To reduce the torque required for electric opening, the hinge system is optimized by modifying the positions of certain components. By increasing the length of tie rod 1, reducing the length of the brace, and changing the position of the support point, the opening moment is minimized. After multiple analyses and comparisons, the optimized positions of the components are determined. The improved hinge system results in a significant reduction in the opening torque at the output shaft of the reducer and the joint between the tie rod and the base. The simulation analysis shows that the opening torque requirements are met and the electric opening force is reduced, ensuring the successful electrification of the trunk lid.

In conclusion, dynamic simulation using Adams software is a valuable tool in analyzing the dynamics of trunk lid opening mechanisms. By accurately simulating and analyzing the forces and motions involved in manual and electric opening, the mechanism design can be optimized to reduce the torque required for electric drive. The simulation results are validated through experiments, confirming the effectiveness and reliability of the dynamic simulation method. The optimized hinge system ensures the smooth transition to electromechanical trunk lids. Overall, dynamic simulation has proven to be a crucial tool in the design and optimization of automotive linkage mechanisms.