Car Door Opening Limiter Metal Injection Molding MIM Parts

Basic Information

The function of the door opening limiter (Door check) is to limit the degree of door opening. On the one hand, it can limit the maximum opening of the door to prevent the door from opening too wide. On the other hand, it can keep the door open when needed, such as when the car is parked on a slope or when there is a normal wind, the door will not close automatically. Common door opening limiters are separate pull-belt limiters, and some limiters are made into one piece with the door hinge, usually with the function of limiting when the door is fully open or half open.

Basic Classification

According to the way the limit force is provided, it can be divided into rubber spring type, metal spring type and torsion spring type.

According to the type of friction, it can be divided into rolling friction type and sliding friction type.

1. Rubber spring type

The working principle is: the limiter bracket is fastened to the car body by a mounting bolt, and the limit box is fastened to the door by two mounting screws. When the door is opened, the limit box will move along the limit arm. Because the limit arm has different height structures, the elastic rubber block will have different elastic deformations, so people need to use different forces to close the door when opening the door. At each limit position point, it can play a role in limiting the door. This structure is the most widely used, and there are many specific forms: some limit arms are stamped structures, some limit boxes use rollers, some limit boxes use balls, and some limit boxes use sliders...but the principle of limiting is the same.

The advantages of this structure are simple structure, low cost, small space occupation, and maintenance-free. The disadvantage is that the requirements for sheet metal are relatively high. If the hinge strength is not enough, the door sinks and it is likely to produce abnormal noise. After running for a period of time, the limit torque decreases rapidly.

The door limiter of this structure generally has two or three gears. Its maximum torque is about 35N.m, the length is generally about 60mm, and the maximum opening angle is generally below 70 degrees. After the durability test, the torque changes by about 30%-40%.

2. Torsion spring type

Its working principle is: integrated with the hinge, usually installed on the lower hinge, in the process of closing the door, the torsion bar deforms to generate different forces to achieve the purpose of limiting.

This structure is mostly used in the European car market and is a patent of Edsha.

The advantages of this structure are low noise, long life, and good limiting effect. The disadvantages are large space occupation, complex structure, high maintenance cost, etc.

This structure of the limiter generally has two or three gears, its maximum door opening torque is 45N.m, the maximum door closing torque is 50N.m, the maximum door opening angle is about 60-65 degrees, and after the durability test, the torque change is about 15%.

Qinhuangdao Zhongwei Precision Machinery Co., Ltd. was founded in 1997 and is a manufacturer and technical solution provider focusing on metal powder injection molding (MIM) and investment casting and forging products. The company is located in Qinhuangdao High-tech Zone, with automotive system 16949 certification, a strong R&D team and technical strength, providing customers with fast and effective solutions and stable product supply.

Since its establishment, the company has always adhered to the principle of customer-oriented, quality-first, independent innovation and continuous improvement. Technology-first development policy.

The company's main business is the research and development, design, production and sales of metal product structural parts. The products can be widely used in key application fields such as consumer electronics, medical devices, and automobiles. It has advantages and rich experience in product research and development, mold development, process design, product manufacturing, quality control, etc.

The company has a stable core team, an excellent technical team, and has introduced advanced equipment to form the core competitiveness of MIM products in the industry and become a strategic partner of MIM products for international customers.