What is the wear ring of a hydraulic cylinder?
The wear rings of hydraulic cylinder (also called a guide ring, support ring or wear belt) is one of the key components inside the hydraulic cylinder. It is mainly used to reduce friction and wear between moving parts, maintain stable movement of the piston or piston rod, and protect the seal from damage by lateral force.
The main functions of the wear ring of a hydraulic cylinder:
Guidance and support
When the hydraulic cylinder is working, the piston or piston rod may be offset due to lateral force, resulting in local wear of the seal. The wear ring evenly supports the moving parts (such as the piston or piston rod) to ensure that they move linearly along the axis and reduce eccentric wear.
Reduce friction
The wear ring is usually made of materials with low friction coefficients (such as polytetrafluoroethylene PTFE, nylon, polyoxymethylene POM or composite materials), which can effectively reduce the sliding friction between the piston and the inner wall of the cylinder, the piston rod and the guide sleeve, improve efficiency and reduce energy loss.
Protect seals
The wear ring shares the mechanical load borne by the seal, preventing the seal from directly contacting the rough surface or bearing excessive lateral force, thereby extending the service life of the seal.
Prevent metal-to-metal contact
Under high pressure or high speed conditions, wear rings can isolate metal parts (such as pistons and cylinders) to prevent wear or scratches caused by direct metal friction.
Typical positions of hydraulic cylinder wear rings:
Piston wear rings: installed on both sides of the piston and in contact with the inner wall of the cylinder.
Piston rod wear rings: installed in the guide sleeve and in contact with the outer surface of the piston rod.
Material selection for hydraulic cylinder wear rings:
The material of the wear ring must have high wear resistance, low friction coefficient and good pressure resistance. Common materials include:
PTFE (polytetrafluoroethylene): extremely low friction coefficient and chemical corrosion resistance.
Nylon (PA): good wear resistance and low cost.
PEEK (polyetheretherketone): high temperature resistance, high strength, suitable for harsh environments.
Filled composite materials (such as PTFE+copper powder or glass fiber): enhance wear resistance and load-bearing capacity.
The difference between wear rings and sealing rings:
Wear rings: mainly undertake guiding and wear reduction functions, usually without sealing function.
Sealing rings (such as O-rings, Gly rings): Focus on preventing hydraulic oil leakage, and require elastic materials to achieve sealing.
Failure effects:
If the wear ring is worn or damaged, the following problems may occur in the hydraulic cylinder:
Accelerated wear or leakage of the seal.
Shaking or stuck moving parts.
Hydraulic cylinder efficiency decreases, abnormal noise or vibration occurs.
Therefore, in the maintenance of hydraulic cylinders, it is necessary to regularly check the wear of the wear ring and replace it in time to ensure system reliability and long life.
Kintowe PFC-2 Hydraulic Cylinder Wear rings are containing homogenously dispersed graphite with solute phenolic resin and high-quality cotton fiber, and finally finished with heat solidifying process under certain pressure and temperature.
This plastic material offers advantages such as superior abrasion resistance, self-lubrication, and corrosion resistance. This has translated to reduced maintenance costs, improved reliability, and an overall increase in productivity. They can work under conditions where oil is littler or even with no oil at all.
For specific product inquiries, please contact our professionals:vanessa@kintowe.com