The teaching of hydraulics deals with the flow behavior of fluids. In engineering and mechanical engineering, hydraulics is about the transmission of signals, forces, and energy. Hydraulics is a branch of fluid technology. The word hydraulics comes from the Greek and can be derived from the composition of the two words h�dor “the water” and aulós “the pipe”.
In this hydraulic script, you can learn the basics of hydraulics and fluid technology.

Characteristics of hydraulic systems
An installation is called a hydraulic system if it works according to the hydraulic principle.
As described at the beginning of this hydraulic script, this means that forces, energy, and signals are transmitted through a liquid. Used fluids include mineral oil, biodegradable liquids, flame-retardant fluids, and water.

hydraulic fluids
mineral oil
biodegradable liquids
flame retardant fluids

Forces transmitted in a hydraulic system are created by pressure. Movement is caused by a volume flow. From the factors pressure and volume flow, the transmitted power results.
The required pressure and volume flow are generated in the hydraulic usually by a pump which is driven by an electric motor. The hydraulic fluid always remains in circulation in a hydraulic system (only water hydraulics can do without it). This means there is a return flow for the hydraulic fluid. For example, the hydraulic fluid can be conveyed by a pump to a consumer (eg hydraulic cylinder) and is fed back from there via a return line to the liquid container.

In principle, the hydraulics works just like the pneumatics. In pneumatics, however, compressed air is used for power and signal transmission, while in hydraulic systems fluids are used. In addition, there is no cycle of compressed air (return flow) in the pneumatic system. The exhaust air is (usually via a silencer) simply blown into the environment. Advantages of the hydraulic system compared to the pneumatics are that much higher forces can be transmitted and very exact and uniform movements can be realized.
Construction of a hydraulic system

A plant that operates on the hydraulic principle usually consists of a liquid container, a hydraulic pump,(pneumatikk) a consumer (hydraulic motor or hydraulic cylinder), which converts the hydraulic energy transferred by the pump into mechanical energy and controls (eg valves).

Areas of hydraulics

The hydraulics I can be divided into the following areas:

mobile hydraulics
aircraft hydraulic
Advantages and disadvantages of hydraulics

Hydraulic systems have the following advantages and disadvantages


Transmission of high forces and high power in a small volume possible
Movements can also take place from a standstill under full load
Power and speed are infinitely variable
Overload protection can be easily and safely realized

Temperature sensitivity of the fluid restricts the hydraulics
High demands on the filtration of the hydraulic fluid
Danger of leaks
Compressibility of the liquid
Applications of hydraulics

Hydraulic cylinders are typically used in a variety of fields, such as forklifts, excavators, lifts, etc. Hydraulic systems(hydraulikk pumpe) are also found in automobiles, wing flap control and landing gear systems, cranes, machine tools, and more.