The fundamental function of the hydraulic system circuit lies in the simple manipulation of energy transfer in the form of hydraulic pressure energy.
From the perspective of energy transmission: hydraulic skills are roughly in the middle of mechanical energy transmission and electrical energy transmission.
From the perspective of transmission characteristics: mechanical transmission and hydraulic transmission equipment can be said to have fixed characteristics. On the contrary, hydraulic transmission equipment and electrical transmission equipment have the same characteristics as continuously variable transmission equipment. In addition to constant power, it is also simple to complete constant Speed and constant torque.
This characteristic of hydraulic skills can generally be summarized as follows:
(1) Simple stepless speed change, wide speed range, that is, the force and torque can be adjusted easily in a wide range;
(2) Good control performance, that is, force, speed, orientation, etc. can be controlled correctly with a high response speed. In addition, it has good adaptability to other control methods such as electrical and mechanical, especially when combined with electrical signal processing, excellent response characteristics can be obtained;
(3) Reliable action and good operation performance;
(4) Appropriate flexibility in structure and characteristics;
(5) Standard components can be used to form loops that complete arbitrarily complex functions.
The reason for these characteristics is to use positive displacement elements as ability converters, namely hydraulic pumps and hydraulic actuators, and use lubricating oil (hydraulic oil) as the working medium. The general disadvantages of hydraulic skills are also related to hydraulic oil. These shortcomings are summarized as follows:
(1) Oil leakage;
(2) Where special fine control is required, the contamination of hydraulic oil has a negative impact on the characteristics of components and equipment. In other words, the management of hydraulic oil has a great impact on reliability and component life.