Hydraulic Cylinders – Buy Online at the Hydromot Hydraulic Shop

Hydraulic cylinders are linear actuators that convert hydraulic energy into mechanical motion. By applying pressure on a piston inside the cylinder tube, it is displaced and generates a linear movement. They enable lifting, pushing, or precise positioning of loads.

Single-acting cylinders: Movement in one direction through hydraulic pressure, return by external force (e.g. self-weight, spring). Simple and cost-effective.

Double-acting cylinders: Movement in both directions through hydraulic pressure. Precisely controllable, higher forces, ideal for complex motion sequences.

• Pivot eyes: Allow pivoting movements in one plane, simple design.
• Spherical bearing eyes: Provide freedom of movement in several planes, contain a serviceable bushing that must be regularly lubricated.

• Application: single- or double-acting
• Required force (piston diameter depending on load)
• Stroke length (piston stroke)
• Operating pressure and stroke speed
• Installation dimensions and mounting type
• Material selection and corrosion protection
• Seal quality

The required force is calculated as:

F = m · g

Example: 500 kg load → 500 × 9.81 ≈ 4905 N (≈ 4.9 kN).

The stroke height affects the work (W = F · h), but not the basic force. For dynamic loads, acceleration and braking forces must also be considered.

• Piston rod: Chromium-nickel or chromium-molybdenum steel, often hard-chromed
• Cylinder tubes: Seamless steel tubes (e.g. E355), internally honed
• Guide bushings: Cast iron
• Seals: Polyurethane, NBR, or FKM

• Construction: excavators, cranes, wheel loaders
• Agricultural engineering: tractors, balers, harvesting machines
• Mechanical engineering: presses, machine tools
• Vehicle technology: tipping systems, agricultural & municipal vehicles
• Industrial plants: manufacturing, automation, lifting & positioning systems

Regular maintenance (e.g. annual seal replacement, inspection of piston rod and tube) is essential for service life. High-quality materials and manufacturing ensure robustness and reliability.

Important factors include:

• High-quality steel alloys and coatings
• Precise manufacturing and assembly
• Seal and guide bushing quality

A properly maintained cylinder can operate reliably for many years.

Rod corrosion often results from damage to the chrome layer, aggressive environments, or condensation. High-quality coatings (e.g. hard chrome, nickel-chrome, ceramic) as well as regular cleaning and protective covers in harsh operating conditions can help prevent this.

Typical signs include external oil leaks, pressure loss in the system, irregular movements, or unusual noises during operation. In such cases, the cylinder should be disassembled, and the seals replaced promptly to avoid consequential damage.