Fracture Analysis of Steel Wire Rope of Car Electric Window Shaker

Analysis of Broken Steel Wire Rope in Electric Car Rocker Window

The rocker windows in electric cars are generally driven by electric motors, and the steel wire rope is used as a lifting force to open and close the rocker window. However, with the long-term use of wire rope, it is easy to cause fatigue fracture of the steel wire rope due to the stretching force and torsion force, which may cause the rocker window to close or even not open, seriously affecting the normal use of electric vehicles. Therefore, in order to avoid the impact of fatigue fracture of steel wire rope on the rocker window, it is necessary to analyze the causes of the fracture of the steel wire rope in the rocker window.

In general, the steel wire rope used in the rocker window of an electric car consists of a plurality of independent steel wires twisted together. Under normal circumstances, the wire rope can maintain the stretching and torsion properties in the different directions of the automobile. However, due to the complexity of the external environment, the temperature change, acid-base problem and improper use of the wire rope, the normal twisting stress that the wire rope can bear is significantly reduced. In addition, if the steel wire rope is not replaced in time within the expiration period, the wire rope will continue to age, weakening the tenacity of the wire rope. In the end, due to too much tension or repeated violent torsion, it will cause the wire rope to break.

At the same time, if you do not pay attention to the maintenance when using the steel wire rope, it is easy to cause mechanical fatigue fracture of the steel wire rope. According to the stretching test and friction test conducted, the number of times of up and down drag is more than one million times, and the tensile friction coefficient of the wire rope is more than four, the surface layer of the wire rope will form deep scratches, which significantly reduce the strength of the steel wire rope and cause fatigue fracture of the wire rope. In addition, if the user violently pulls the steel wire rope, it will also easily cause the wire rope to break.

Therefore, in order to avoid the fatigue fracture of the steel wire rope, it is necessary to improve the maintenance awareness of the user and replace the steel wire rope in time. When replacing the wire rope, it is necessary to choose the wire rope which is suitable for the rocker window of the electric car according to the specifications of the wire rope, so as to effectively reduce the fatigue fracture of the wire rope. At the same time, it is necessary to pay attention to the maintenance of the wire rope in the daily use, and avoid the violent pulling or violent torsion of the wire rope, and strengthen the lubrication protection. In this way, the fatigue fracture of the steel wire rope in the rocker window of the electric car can be effectively prevented.

The broken car electric window motor steel wire rope is typically divided into two types: one is the lift electric window motor and the other one is the left and right switch electric window motor. To analyze the cause of the failure of the electric window motor steel wire rope, the following aspects will be taken into consideration: the size of the steel wire rope, its load capacity, the number of turns and reels, the torsion of the wire rope itself, the correct installation of the cord, and the inevitable wear after a period of use.

In terms of size and load bearing capacity, the current electric window motor steel wire rope should meet the requirements of the car production assembly process. Therefore, the failure of the steel wire rope due to the size and load capacity of the rope itself usually does not occur.

In regards to the number of reels and turns, the steel wire rope should not exceed the number of turns and reels designated during the car production assembly process when the electric window motor is operating. Therefore, when the steel wire rope breaks, it is necessary to inspect the number of turns and reels of the steel wire rope. Generally, if the number of turns and reels exceeds the specified value, it is necessary to adjust the number of turns and reels.

In terms of torsion, the steel wire rope should maintain certain torsion during the operation. Therefore, when the steel wire rope breaks, it should pay attention to whether the steel wire rope has reached the specified torsion value. Generally, the torsion of the steel wire rope should be increased to 120-180 degrees.

In terms of installation, the steel wire rope should be installed in a correct manner. Otherwise, it is easy to cause damage to the wire rope, resulting in broken wire rope. Therefore, it is necessary to check whether the steel wire rope is installed correctly.

At last, after a period of use of the electric window motor steel wire rope, wear will occur. Therefore, it is necessary to replace the electric window motor steel wire rope for maintenance in advance to prevent the steel wire rope from breaking.

In conclusion, the broken car electric window motor steel wire rope is often caused due to an improper number of reels, torsion, or incorrect installation. Therefore, it is important to pay attention to the number of reels, the torsion of the steel wire rope and the correct installation when installing, so as to avoid the breakage of the steel wire rope.