The pressure in the cylinder of the gas spring decreases when the temperature drops, causing a decrease in force. This results in a gradual increase in the point of torque balance between the gas spring and the trunk door. As a result, the trunk door can automatically bounce up even at extreme temperatures of -30 to -40 degrees Celsius. It is important to note that this process is entirely manual and is considered normal.
On the other hand, at high temperatures, the pressure inside the gas spring increases due to thermal expansion. Consequently, the gas spring can lift the rear door without reaching the normal temperature angle. Therefore, it is normal for the door to open automatically when lightly lifted during summer.
Contrary to popular belief, the door's automatic opening in winter is not due to internal pressure leakage. It is rather caused by the expansion and contraction of the gas within the spring. Additionally, during usage, there may be grease present on the gas spring. However, this should not be mistaken for an oil leak.
To prevent dust and impurities from entering the cylinder, the gas spring is equipped with a dust cover and piston rod with an interference fit. When the piston rod is extended, the lubricating oil from the guide block is brought out. Conversely, when the rod is compressed, the oil film on its surface is blocked by the dust cover and cannot flow back. This cyclical process results in more oil accumulating on the outer surface of the dust cover, creating a grease-like appearance on the gas spring. Thus, the presence of grease on the gas spring is a normal phenomenon and not indicative of an oil leak.
The gas seal is the core component of a self-locking gas spring and its role is to seal off the gas and oil. This is achieved through an interference fit with the piston rod. Unfortunately, the inner lip surface of the piston rod tends to accumulate foreign matter, such as paint, which can cause air seal failure. The air seal will be squeezed by the accumulated matter to create an air leakage channel if left unchecked. It's crucial to avoid wrapping the piston rod with tape or cloth and to prevent collision damage in order to avoid impairing the gas spring's functionality. To keep your car running smoothly, always be mindful of these key maintenance factors.
When it comes to self-locking gas springs, there are four types of joints to consider: single piece, single ear, double ear, and universal ball joint. It's important to choose the fitting type that matches the size of the gas spring and is appropriate for the installation site. The universal ball head type is highly recommended, since it can automatically adjust the connection angle during operation and eliminate lateral force, making it ideal for high-precision installations. Regardless of the joint type chosen, the key is to ensure that the gas spring doesn't interfere with the smooth opening and closing of the rear door or cover. In summary, proper joint selection is critical for optimal performance and user safety.