How to effectively control the positioning and routing of automotive wiring harnesses?

The effective fixation of the harness and how to control its direction to maintain the gap between it and the surrounding parts is an important part of the three-dimensional layout design of the harness, and it is also a problem often encountered in the product development process. 1. Fixation of wiring harness 1. Fixation of cable tie/buckle is the most commonly used method, which is widely used. Considering the cost and purchase cycle, it is necessary to choose the commonly used buckles as far as possible, or the buckles with very large consumption. The large consumption does not necessarily refer to the models of their own main engine factories, but also the models with good sales of other main engine factories. In addition, the types of cable ties shall be reduced as much as possible to facilitate the management of materials and quality. 2. The fixation of plastic bracket is sometimes limited by the body structure and wiring harness layout space, so it is necessary to develop a separate plastic bracket for wiring harness protection and fixation. This kind of plastic stent is usually self-developed and expensive. But in fact, the cost is relative, we can find that the sales of very good models, this plastic bracket is actually used a lot. 3. when that fix harness is fixed by adopt the clamping groove structure of other components, the existing other component or a new clamping groove structure can be fully utilized for fixing. In this case, because it is difficult to locate, it is necessary to mark the harness separately to facilitate manufacturing and assembly. 4. Tape fixing (not recommended) Only use tape to tie the harness to other components. This fixing method is not reliable, especially in harsh environments (vibration, high temperature, high humidity, etc.), and is not allowed to be used. In addition, even if the layout environment is relatively good, it is not recommended to use this fixing method. If it must be used, it must be reviewed and approved, and special attention should be paid to the vehicle durability test. 2. Common fixing methods of the harness — — Selection of the buckle When fixing the cable tie, the following factors should be considered: 1. Ambient temperature. Heat resistant type or heat intolerant type; if the hot rolled belt is used for fixing the high temperature part in the engine, the high temperature resistant cable tie shall be used. 2. Waterproof. Screw clamp or waterproof rubber band shall be used for stud lifting. 3. Anti-rotation. Select card 7x 12 holes (anti-rotation) or select round holes (not anti-rotation). Generally speaking, in order to ensure the direction of the harness, the anti-rotation buckle is generally selected, but the anti-rotation buckle will affect the assembly. For the places that are not easy to assemble and have no special requirements for anti-rotation, it is necessary to use a tie with a round hole. 4. Space avoidance. According to the specific type of avoidance, you can choose to lift, offset, guide, right angle and other buckles. 5. Mutual avoidance. Select the corresponding expanding clamp or the buckle with special structure as required to separate the harness from other components and keep a certain gap to avoid wear caused by mutual movement. 6.Installation structure and layout space. For the installation limit that needs to increase the position of the fixing point, you can select the corresponding stud card, sheet metal card, flat type and other buckles as required. It should be pointed out that for the sheet metal card, due to the damage of the body paint, the place with high requirements for appearance (customer perspective) should be carefully selected. If it must be used, it is recommended to choose the plastic type without damaging the body paint. For the plate-type buckle bound and fixed with adhesive tape, it is recommended not to use the place with thick and thin branches to prevent the buckle from falling off due to adverse environment. Also because of the curling, the size requirements are very good, try not to use continuously, in order to avoid the difficulty of assembly caused by partial holes. III. Select the fixing position of low-voltage harness of the vehicle. The harness of the whole vehicle is arranged in every corner of the vehicle, and the damage of the harness directly affects the electrical performance of the vehicle. In the design process of automotive wiring harness, safety is the primary consideration, and the good fixed point setting and the choice of fixed mode are the premise of the reliability of wiring harness layout. The following principles shall be followed to determine the fixed point position of the harness: 1. The distance between the harness and the two positioning points shall not be too large, and shall be controlled at about 300 mm. In the harsh environment such as muddy water, the fixing distance of the cable tie shall not exceed 150 mm, and 7 * 12 cable tie or stud cable tie shall be used as far as possible. 2. The harness is provided with right-angle corners, and the right angles on both sides need to be added with fixed points. In the case of obtuse corners, the straight line distance can be controlled to avoid the inflection point of acute angles. 3.Set the positioning point on the trunk of the branch point, which shall be as close as possible to the fixed point if the process permits (minimum 10 mm), and the distance between the fixed point and the fulcrum shall not be more than 100 mm. 4.In high-risk areas, all wiring harness plugs need to be stress-relieved. The wiring harness should be held 120 mm behind the plug and have a fixed point (tie). If this is not possible, strain relief shall be provided behind the connector (e.g., by tying the harness to the plug-in housing structure), and the fixing point shall be added within 300 mm behind the connector.

---------------------------------------------------------------------------------------------------

2、 on the World Trade Electronic Products Network Platform and Sales Product Profile: World Trade Electronic Products Network-professional agent/production/sales of various { connector | harness | cable products }; If you have relevant [connector | harness | cable products] procurement/purchase needs or want to buy/know what connector | harness | cable products solutions we can provide, please contact our business personnel below; if you have relevant [connector | harness | cable products] sales/resources and promotion needs, please click "Business Cooperation ←" to negotiate with the specialist!