Selection of Rubber Parts for Wire Harnesses

Rubber transition parts are mainly used for connecting the via holes of the vehicle wiring harness, which play the functions of wear resistance, waterproofing and sealing. This paper introduces the selection method of wire harness adhesive products, analyzes the types of wire harness adhesive products, the selection of rubber compounds, applications and common problems, and introduces the performance requirements and test methods of wire harness adhesive products.

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1. According to the structure of rubber, the types of rubber products are divided into skeleton (guide structure, the material is mostly PA66) and skeleton-free. Remarks: 1--Rubber sheath; 2--Plastic bracket guide structure) According to the film fixation method, it is divided into single-hole fixation and double-hole fixation. The rubber parts of the single-hole unguided structure are held together. When selecting, choose single-hole fixation or double-hole fixation according to actual needs. When the assembly of rubber parts is laborious and the stress concentration leads to lax sealing, it is recommended to design them as skeleton rubber parts. 2. Material selection of wire harness rubber products Commonly used materials for rubber products generally include natural rubber, neoprene, silicone rubber, EPDM, etc. Natural rubber characteristics: It has good elasticity and mechanical strength, good bending resistance and flexibility, high tear strength and good cold resistance. Disadvantages: Not resistant to aging, not resistant to oil and ozone, flammable. Neoprene properties: ozone resistance, heat aging resistance, good oil resistance, flame retardant and self-extinguishing properties, but poor low temperature resistance. Silicone rubber properties: good heat resistance, cold resistance and weather resistance; The disadvantage is that it is not resistant to oil. 3. Characteristics of ethylene and propylene: good weather resistance, ozone resistance, heat resistance, corrosion resistance, acid and alkali resistance, and high strength and high elasticity; Disadvantages: poor adhesion, elasticity is not as good as natural rubber, and oil resistance is poor. Due to the good comprehensive performance of EPDM, at present, EPDM materials are generally used for automotive wiring harness rubber products. 4. Application of rubber products The opening positions of steel wire rope rubber parts are roughly divided into: front cabin, four doors, floor, canopy and rear door. Try to choose the left and right sides of the front cabin opening to ensure that the wiring harnesses lead consistently and avoid high-temperature areas. The opening of the four doors should ensure that the opening height of the main body of pillars A and B is higher than the opening height of the four doors of the plate to prevent water from flowing into the room.

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