What factors should be considered when choosing a car wire harness cover?

When we choose the Automotive Wiring Harness Protection Sleeve, we often have to consider many factors, in order to make the Automotive Wiring Harness Protection Sleeve perfectly fit to the place where we need it, the editor summarizes a few for your emergency needs.

1. Working medium and working conditions. This is the most basic question, what is the main purpose of the Cable Sleeve you choose, such as high temperature resistance, liquid drip prevention, etc.
2. The compatibility between the product and the working medium, and then consider the pressure, temperature, continuous working time, operating cycle and other conditions of the seal, and the temperature rise caused by frictional heat should also be considered when used in a rotating situation.
3. Sealing form: When the shaft seal is installed radially, the deviation between the inner diameter of the Automotive Wiring Harness Protection Sleeve and the sealed diameter should be as small as possible. For the hole seal, the inner diameter should be equal to or slightly smaller than the groove diameter. When installing axially, the pressure direction should also be considered. When the internal pressure is applied, the outer diameter of the Automotive Wiring Harness Protection Sleeve should be about 1% to 2% larger than the outer diameter of the groove. 1%~3% smaller.
4. Other factors affecting sealing performance:
1) Hardness: Determine the compression amount of the Automotive Wiring Harness Protection Sleeve and the allowable extrusion gap of the groove.
2) Extrusion gap: It is related to the system pressure, the cross-sectional diameter of the Automotive Wiring Harness Protection Sleeve and the hardness of the material.
3) Compression deformation: In the case of pressure, in order to prevent plastic deformation. The maximum compression allowed by the Cable Sleeve is about 30% in the static seal and about 20% in the dynamic seal.
4) Pre-compression amount: In order to ensure the tightness in the groove of the Automotive Wiring Harness Protection Sleeve, an initial compression amount should be reserved, and the pre-compression amount relative to the cross-sectional diameter is usually about 15% to 30% in static sealing , It is about 9%~25% in the dynamic seal.
5) Stretch and compression: For the hole seal, the Automotive Wiring Harness Protection Sleeve is in a stretched state, and the maximum allowable stretch is 6%. For the shaft seal, the Automotive Wiring Harness Protection Sleeve is compressed along the circumference direction, and the maximum allowable circumference is The amount of compression is 3%.
5. The protective sleeve of the automobile wiring harness is used for low-speed rotating motion and rotating shaft seal with a short operating cycle. When the peripheral speed is lower than 0.5m/s, the selection of the Cable Sleeve can be based on the normal design standard; when the peripheral speed is greater than 0.5m/s When it is used, it is necessary to consider the phenomenon that the elongated rubber ring shrinks after being heated, and the Cable Sleeve should be selected so that its inner diameter is about 2% larger than the diameter of the sealed shaft.