Introduction: There are many kinds of transmission modes, and there are more widely used transmission modes such as mechanical transmission, electrical transmission, hydraulic transmission and pneumatic transmission, but these transmission modes are not perfect. In this paper, the advantages and disadvantages of hydraulic transmission will be introduced.
Hydraulic transmission is a kind of liquid for the working mechanism, that is, hydraulic oil, through the change of the sealing volume to transfer power, through the pressure energy inside the liquid to transfer power transmission mode, the role of liquid and mechanical transmission gear and chain transmission components are the same.
The application of hydraulic transmission is everywhere, from water piston to aircraft, usually can be widely used in lifting equipment, hydraulic press, aircraft flap, ship rudder and automobile braking system. Each transmission mode has its own advantages and disadvantages, and hydraulic transmission is no exception. Although hydraulic transmission is more reliable than other transmission methods, we can consider the main advantages and disadvantages of hydraulic transmission first.
Advantages of hydraulic transmission
1. convenient layout: the various components of hydraulic transmission can be arranged conveniently and flexibly according to the demand, which is also better than mechanical transmission. For example, oil pumps in environmentally friendly Wells can be driven by hydraulic transmission to solve the problem of low efficiency of the drive shaft of the pump.
2. small volume, light weight: in the same power, hydraulic transmission device is smaller than other types of transmission device, light weight. For example, the volume of the hydraulic motor under the same power is about 12 to 13 percent of the ordinary motor, and the weight of the hydraulic motor is only one sixth of the ordinary motor.
3. the speed range is large: hydraulic transmission device can rely on variable pump or variable motor to achieve stepless speed regulation, the speed range can reach 1:2000, and can be in the operation of the hydraulic transmission device stepless speed regulation.
4. Overload protection can be realized: relief valves are usually installed to prevent overload, and the movement of each component of hydraulic transmission is in hydraulic oil, so it can be automatically lubricated. Therefore, the service life of each component of hydraulic transmission will be longer.
5. easy to realize automation: compared with other transmission methods, hydraulic transmission is easier to realize the automation of equipment, by relying on a variety of control valves, and with the use of electrical control system, you can achieve complex automatic sequential action, but also can realize remote control.
Disadvantages of hydraulic transmission
1, not suitable for long-distance transmission: in the transmission process, hydraulic oil needs to be pressurized into high pressure hydraulic oil by hydraulic pump, and high pressure hydraulic oil will reach the actuator through a long pipeline, after two energy transformation. When hydraulic oil passes through a long pipeline, there will be a certain pressure loss, and its transmission efficiency is usually relatively low, so hydraulic transmission is not suitable for long-distance transmission.
2, easy to be affected by temperature changes: usually hydraulic transmission in high temperature or low temperature environment to work is a relatively difficult thing. When working in a high temperature environment, the viscosity of the hydraulic oil will be low, so the hydraulic pump and some components will produce large internal leakage, and the volumetric efficiency will be low, so as to affect the overall efficiency. When working in a low temperature environment, the viscosity of the hydraulic oil will be relatively high, which will produce a large pressure loss, and even some parts may not be able to work normally, such as the filter.
3, easy to be affected by impurities: the existence of impurities of hydraulic oil on the various components of the hydraulic transmission is relatively large, easy to harm the performance of the hydraulic transmission device. In addition to the working mechanism, the hydraulic oil has a more important role is lubrication. If there are impurities in the hydraulic oil, when the parts of the hydraulic transmission device begin to move with each other, it will be seriously worn to the surface of the parts, and even directly blocked to the filter, or stuck spool.
