Hydraulic cylinder is some of the executing object.And it can convert pneumatic pressure into a linear movement.They are widely used in industry and various types of mechanical pneumatic systems,like Trailer trucks, material handling and lifts. To figure out how these tools work in a whole system, it’s necessary to know all about their components if you want to operate it correctly and efficiently to ensure your hydraulic cylinder is functioning at peak performance.Let’s go and take a look at each of the components carefully so you can choose one suits your accessory effectively.
1. Piston Rod
What is a Piston Rod
The other name is called the cylinder rod.It is one of the core components of the pneumatic cylinder to provide stability.It is mainly used to support the piston in doing work and transmitting power, so it has high movement frequency and technical requirements.
How does it Work
Its one end is attached to the piston of the cylinder. The other end connected to the cylinder head.
The end connected to the cylinder has a guide strip made of low-friction material embedded in the end cover, which can accurately guide the movement of the piston and prevent deflection.And the other end attached outside the cylinder, connecting the hydraulic cylinder with the machine components that is used for work, providing the place where external tools to get the cylinder’s power.
Materials and Surfaces
It is usually made of stainless steel or alloy steel, which is highly corrosive and strong.The piston rod must be very sturdy to bear the forces that is made by the cylinder. And for the piston rod surface, it is also necessary to be smooth to prevent damage to the internal seals.
2. Piston
What is a Piston
The piston is the core component of the Hydraulic cylinder.It is placed in the cylinder like a round pancake and connected directly to the piston rod that carry force onward to load it needs to transfer to.
How does it Work
The piston is usually made of metal materials and cooperates with the cylinder to form a sealed space to ensure the effective transmission of air pressure.The piston is like the plug in an air pump, which drives the piston rod to work when pushed or pulled. When the pneumatic cylinder is working, the pneumatic cylinder uses air pressure to push the piston to achieve the conversion of mechanical energy.
Materials
Hydraulic cylinder pistons are mainly made of aluminum alloy, cast iron, and alloy steel, depending on the application context.The material of the piston is crucial to the efficiency of the hydraulic cylinder. You can choose the required material according to the specific applications.
Cast aluminum alloy pistons are lightweight and offer excellent thermal conductivity. While alloy steel has excellent wear resistance and strong corrosion resistance. And cast iron can be used in scenarios where higher strength and wear resistance are required.
3. Cylinder Tube
What is a Cylinder Tube
Cylinder tube is known as cylinder barrel also.When refers to cylinder tube, as you can imagine,it’s a component in hydraulic cylinder to hold the piston and gas. It formed from a strong, seamless steel tube and the hydraulically driven piston moves there inside.
Surface of the Cylinder Tube
The inside of the cylinder tube undergoes a honing process to ensure a perfectly smooth surface. This smoothness is essential for efficient piston movement and optimal sealing performance.Target provides cylinder tubes and piston rods of various materials and uses.You can choose and use them together according to your needs.
Major Factors in Selecting Cylinder Tube Diameters
The diameter of the hydraulic cylinder oil pipe is usually limited by the system pressure and flow requirements and installation space.Its most common tubing sizes range from 6 – 50 mm.
System Pressure
Low-pressure systems (<10 MPa): Commonly used tubing has an inner diameter of 12-25 mm, such as in agricultural machinery or small equipment.
Medium- and high-pressure systems (10-31.5 MPa): Recommended inner diameters are 8-20 mm, such as in hydraulic cylinders used in construction machinery.
Ultra-high-pressure systems (>31.5 MPa): Thick-walled tubing with an inner diameter of 6-12 mm is required to ensure pressure resistance (refer to ISO 18752).
Flow Requirements
Flow rate requirements: The diameter is proportional to the flow rate. For example, at a flow rate of 30 L/min, the inner diameter must be ≥15 mm to avoid excessive flow rates (SAE J517 recommends a flow rate of no more than 6 m/s).
Installation Space
If your compact equipment limits the use of small diameter hydraulic pipes, please simultaneously improve the material strength to meet the requirements of the operation.For example, use stainless steel or carbon steel.
4. Bearing Band
What is a Rod Bearing Band
A rod bearing band is a ring-shaped part in a hydraulic cylinder that prevents metal-to-metal contact between the piston rod and the cylinder bore, helping to prevent wear on critical components. It is typically a circular or two-piece semicircular shell that matches the shape of the piston rod and cylinder bore.Target Hydraulics production is strictly processed according to national standards and can match various types of bearing hoops.
What is a Piston Bearing Band
The piston bearing band of the hydraulic cylinder is a component fixed to the piston to support ,centers the piston and guide the movement of the piston rod.They secure the bearing in place, and support radial loads, ensuring proper function of the bearing at the end of the piston. When you choose the bearing hoop, you can choose a standard model or a customized model according to your needs.
Position
Piston bearing bands are typically installed on the side of the piston opposite the rod, while rod bearing bands are installed on the pressure side of the rod seal. This arrangement keeps the piston bearing bands further away from the rod bearing bands.
5. Seals and Rings
What are the Seals and Rings
Seals and rings play an important role and they are usually used on the two sides of the piston. Their main function is to prevent the gas and hydraulic oil generated during the operation of the hydraulic press from being discharged from the cavity, thereby achieving the pressure required for efficient operation in the cavity.
The Type of the Seals
The shape of seals are vast, such as O-ring, U-ring or V-ring seals.Take O-rings as an example,they are usually installed in grooves to provide static sealing between non-moving parts.And they are able to withstand great stress by fitting tightly to the threads at both ends and connecting them with bolts or nuts, thus ensuring the strength of the seal.
6. Cylinder Head&Base
Cylinder Head
The cylinder head is securely fastened to the cylinder barrel by an integral rod seal or gland.It helps maintain internal pressure by closing off the pressure chamber at one end of the cylinder and ensuring that no fluid leaks out.This allows a particular type of hydraulic system to perform best and prevents any potential damage which is caused by a long-term lack of proper maintenance.These components are critical to maintaining reliability and efficiency.
Cylinder Base
The base is a component used to fix the cylinder, which allows the cylinder to work more stably.In simple terms, it is like a bracket installed on the cylinder to prevent shaking or displacement and support the cylinder.If you are looking for a material of a cylinder base to fit your Cylinder in a common use, steel, cast iron, and aluminum used in making this component can accommodate your needs. If you need this kind of accessories, you can contact us for more details.
7. Cylinder Wiper
The wiper is a component used to remove impurities and dust from the surface of the piston rod. It is installed on the inside of the cylinder end cover to extend the life of the seal and keep the piston rod clean.The wiper mainly relies on compressed air to push the piston back and forth, driving the wiper arm shaft to swing to complete the wiping action.
8. Branch Pipe
It refers to the interface mounted on the hydraulic cylinder block or port for connecting the compressed air hose or line, which is the passageway for compressed air in and out of the cylinder working chamber. When you are choosing such fittings, selecting the correct fitting and ensuring that it seals against the branch pipe is vital to the proper functioning of the cylinder and ensuring its efficiency.
Conclusion
When it comes to how to select the right accessory for your hydraulic cylinder,understanding each one in detail and how’s the quality of this can help you pick the fittest one for your applications.The components of hydraulic cylinder are complicated. If you don’t know how to choose particular components of yours, you can contact us for more detailed information.
