Rear door hinge structure design scheme_hinge knowledge 2

1.

A wide-body light passenger project is a project that is completely designed based on data and utilizes the advantages of accurate digital data, fast modifications, and seamless interface with structural design. It seamlessly integrates shape, structure, and digital modeling throughout the project process. By introducing stages of structural feasibility analysis, the project achieves the goals of structural feasibility and satisfactory modeling, and releases the final design in the form of data. The inspection of the appearance CAS digital analog CheckList at each stage is extremely important. This article aims to provide an in-depth analysis of the rear door hinge design.

2. Rear door hinge axis arrangement:

The core focus of the opening motion analysis lies in the hinge axis layout and hinge structure determination. To meet the requirements of opening the rear door 270 degrees, the hinge must be flush with the CAS surface and have a suitable inclination angle. The following steps outline the analysis process:

a. Determine the Z-direction position of the lower hinge, which considers the space for reinforcement plate arrangement and welding process size.

b. Arrange the main section of the hinge based on the Z direction of the lower hinge and determine the four-axis positions of the four-linkage system.

c. Determine the inclination angle and forward inclination of the four axes using the method of conic intersection.

d. Determine the position of the upper hinge based on the distance between the upper and lower hinges.

e. Arrange the main sections of the upper and lower hinges in detail, considering manufacturability, fit clearance, and structural space of the four-bar linkage mechanism.

f. Perform DMU movement analysis to analyze the back door's movement and check the safety distance during the opening process.

g. Adjust the parameters of the hinge axis inclination angle, forward inclination angle, connecting rod length, and distance between the upper and lower hinges to analyze the opening feasibility of the rear door. If adjustments are unsuccessful, the CAS surface needs to be modified.

3. Rear door hinge design scheme:

The rear door hinge adopts a four-bar linkage mechanism. Due to the adjustment in shape, three design options are proposed:

3.1 Scheme 1: Ensures alignment with the CAS surface and parting line, but has disadvantages in terms of appearance and structural risks.

3.2 Scheme 2: Protrudes the hinges outwards to eliminate gaps with the rear door in the X direction and provides structural advantages.

3.3 Scheme 3: Matches the outer surface of the hinges with the CAS surface but has a large gap between door links.

After a comparative analysis and discussions with modeling engineers, it is determined that the third scheme is the optimal solution.

4. Summary:

Designing the hinge structure requires considering various factors such as structure, shape, and optimization. The forward design approach in the CAS design stage allows for meeting structural requirements while maintaining a high-quality appearance. The third scheme is chosen to minimize changes to the outer surface, ensuring consistency in the modeling effect. AOSITE Hardware is committed to continuous improvement in product quality and applies the craftsman spirit to manufacturing. With a focus on R&D, AOSITE Hardware has become a leading tool manufacturer in the industry.