How do you calculate a gas spring?

Calculating a gas spring may seem simple, but in reality, it almost always requires customization. Not every gas spring suits every application. Choosing the wrong one can lead to inefficiency or even safety issues. Here, we explain how to calculate a gas spring, which factors are essential, and how Brimotech’s expertise can assist you in the process.

How do you determine the gas spring you need?

When selecting a gas spring, consider several factors, including:

• The weight of the object to be supported.
• The direction and angle of the object’s movement.
• The installation position of the gas spring.
• The use of connection parts.
• The ultimate function of the application.

The weight, center of gravity, and mounting position of the gas springs determine the required force. Additionally, it is crucial to know the intended outcome of the application. For example, is the gas spring for a hatch that should stay closed under its own weight and only provide support during opening? Or should it move a weight vertically over a certain distance? These factors together determine the position and specification of the gas springs to be applied.

A “simple” hatch makes force calculation relatively straightforward, but force alone is not enough. Gas springs have a specific stroke during which the force (progression) increases with every millimeter of compression. This progression varies per gas spring and must be considered. Selecting the right connection parts is equally important for proper functioning, long lifespan, and seamless integration into the application.

In short, calculating the force of gas springs is straightforward in situations where their position is already known. The required force can be determined using the moment equation, as briefly outlined below.

How strong should a gas spring be?

The strength of a gas spring is determined using a formula based on the moment equation:
Fg x Sg = Fk x Sk

Where:

• F1 = {[(M x D) : L] : n } + (10% ~ 15%)
• M= Weight of the valve in [N].
• B= Center of gravity of the valve
• C= Attachment point to the valve
• S= Attachment point to the frame
• D= Horizontal distance from center of gravity to pivot point
• L= Distance of gas spring vector to pivot point
• n= Number of gas springs
• 1kg = 9,81N

Although this formula appears simple, factors such as shifting center of gravity, angle changes, and progression introduce complexity. By incorporating these variables into our software, we calculate the optimal force and installation position. At Brimotech, all calculations are performed in our proprietary 3D software system, allowing for instant adjustments.

Using our advanced 3D software, we analyze your application. This software not only calculates the required force but also generates an installation diagram. This enables seamless integration of the gas spring into your design—ideal for complex applications in industries like yacht building and food processing.

Why is customization important?

Many competitors offer standard calculation tools for gas springs, providing a quick initial estimate. However, these tools rely solely on theoretical calculations and don’t account for real-world variables such as:

• Correctly chosen connection parts.
• Proper gas spring positioning to accommodate necessary damping.
• Choosing a longer stroke with lower force due to application material.

At Brimotech, we understand that every application is unique. That’s why we provide tailored solutions that perfectly align with the specific requirements of your project.

Whether you operate in yacht building, the food processing industry, or bicycle parking systems, our experts help you select a sustainable, safe, and efficient gas spring.

Contact us today for tailored advice or a custom calculation.