A brief discussion on the design standard of automobile connector and its application
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This article from the four basic structure of automotive connector of automotive connector design criteria is introduced, for the assessment of the stability of automotive connectors, for automotive connector of three kinds of failure modes were analyzed, and the interpretation of the change and development of automotive connectors, finally for the development and the change of market demand, and gives the corresponding auto connector application examples.
automobile connector form and structure is changing, it is mainly composed of four basic structural components, namely: contact, shell (depending on the variety and fixed), insulator, accessories. These four basic structural components enable the automobile connector to act as a bridge.
contact element is the core part of the electric connection function of automobile connector. In general, the contact pair is composed of a positive contact and a negative contact element, and the electric connection is completed through the insertion of the Yin and Yang contacts. Positive contact for rigid parts, its shape is cylindrical (round pin), Fang Zhuxing (square pin) or flat (insert). The positive contact parts are made of brass and phosphor bronze. Negative contact piece that Jack, is the key parts of the contact, it relies on elastic structure in and pin inserted timely elastic deformation and elastic force and positive contact pieces formed in close contact, to complete the connection. Jack structures are so many, cylinder type (cleavage groove, necking), tuning fork type, cantilever type (a longitudinal slot), folding type (longitudinal grooving, figure 9), box shaped (Jack) and hyperboloid wire spring jack. < br > < br > shell, also known as shell, automobile connector housing, it is arranged in the insulating installation plate and a contact pin provides mechanical protection and provide plug and socket inserted timely alignment, and the connector is fixed to the device.
insulator is also often referred to as the automotive connector base or mounting plate, it is the role of the contact parts in accordance with the required position and spacing of the arrangement, and to ensure that the contact between the parts and the insulation performance of the shell. Good insulation resistance, voltage resistance and workability are the basic requirements for the selection of insulation materials. Annex
annex and installation accessories. The structure accessories such as the clamping ring, the positioning key, the positioning pin, the guide pin, the connecting ring, the cable clamp, the sealing ring, the sealing pad, etc.. Installation accessories such as screws, nuts, screws, spring ring, etc.. Most of the accessories have standard parts and common parts. < br > < br > with the rapid development of automobile industry, car of a variety of functional parts and various spare parts are in constantly to the intelligent, sophisticated, and the reliability of the direction of development, the automobile connector structure design, appearance design and material also put forward higher requirements, with certain design criteria. Design standard
car connector
car connector must comply with USCAR - 20 standard, this is the performance standard for automotive electrical connector systems, automotive connectors used in the whole period stipulated in the electrical connector contact surface should be reliable, including the following nine factors:
1) connector contact material is stable and reliable;
2) positive force stable;
3) current and voltage stabilizing circuit;
4) temperature requirements within the prescribed range, including the ambient temperature and the temperature rise of
5); robust;
6) with high speed and long distance communication connector must use the same computer, automotive connectors must be able to work reliably in harsh conditions
7); connector insertion force: 20.5kg;
8) connector retention: 2.5kg;
< BR>9) resistance: 40~120 C
a typical light vehicle has about 1500 connection points, of which 50% to 60% for the key distribution functions. Automotive connectors are used in an increasingly hostile environment, including temperature (as low as minus 40 degrees C, up to 155 degrees C), vibration, oxidation and friction, which shows the importance of design research. < br > < br > actually this thing do not simple, most commercial electronic components failure up to let a person feel frustrated annoyance, but if the key auto parts connection problems, causes a fire alarm, brake or airbag failure, lead to serious consequences.
connector manufacturers must identify and analyze the physical and mechanical phenomena that may affect the performance of the connectors in the environment. In accordance with the requirements of the vehicle manufacturers, in order to assess the stability of the connector, connector manufacturers to implement a fine test procedures. If a connector failure occurs, most of them can be identified as one of the following three failure modes: friction and corrosion, electrical failure, and connector insertion. The following is the introduction of the three failure modes.
automotive connectors of the three failure modes
corrosive gases, high humidity and strong oscillation is caused by oxidation and friction and corrosion, and lead to the three main conditions of connector failure. These environmental factors will cause a great impact on the tin and tin contact surface, a connector surface 90% belong to this situation. The connection between
cable and terminal is one of the main reasons for the failure of the warranty and connector system. For automotive wiring systems, the press is a very common method for connecting terminals to cables. This process has been proven to be reliable. Compared with the welding method, it is more economical and easy to operate in the aspect of improving the reliability of the compression connection. When installing wiring in the assembly plant to the car, improper connection of the connector may cause the connector fault. In order to overcome this problem, the design engineers have developed a wide variety of connector locking devices. Another way is to use a plug assisted