1. Definition of hydraulic transmission

Hydraulic transmission uses oil as the medium to transmit the power of the engine, instead of the traditional clutch and gearbox. Specifically: the rotation of the engine drives the transmission oil through a device similar to a water pump, and the transmission oil drives a device similar to a water turbine to rotate, thus transmitting the power of the engine to the transmission shaft. The advantage of this transmission method is that it is smooth and can be easily changed. But because fluid movement consumes energy, the fuel consumption of hydraulic transmission is higher than that of mechanical transmission.

Second, the advantages of using hydraulic transmission

1. Compared with other types of transmission devices, the hydraulic transmission device is small in size and light in weight under the same power condition, so the inertia is small and the action is sensitive, and it can realize frequent starting and reversing.

2. It is easy to realize stepless speed regulation, and the speed regulation range is large.

3. It is easy to realize overload protection, and it is generally equipped with a safety valve to prevent overload. Runs smoothly and absorbs shock and vibration easily.

4. The hydraulic transmission can be transmitted in various directions, and it is easy to realize reciprocating transmission. Due to its small size and high power transmission, complex motion forms can be transmitted in a small space. These characteristics make hydraulic transmission widely used in combined machine tools and automatic lines.

5. It is easy to operate and easy to realize automation, especially when it forms an electro-hydraulic composite system with an electrical control system, the above advantages are more obvious.

6. The hydraulic components are easy to standardize, serialize and generalize, and are easy to promote and use.

3. Disadvantages of using hydraulic transmission

1. Due to the inevitable leakage of the working fluid, the slight compressibility of the oil, and the elastic deformation of the pipeline, hydraulic transmission is not suitable for transmission systems with strict transmission requirements.

2. It requires a high level of manufacturing technology. Use and maintenance must also have a high technical level.

3. When the oil temperature and load change greatly, it is not easy to maintain the stability of the load movement speed. Oil contamination has a significant impact on the performance of hydraulic systems.

4. The flow of oil in the pipeline will cause pressure loss. When the pipeline is long, the pressure loss will be greater and the power transfer efficiency will decrease. Therefore, hydraulic transmission is not suitable for long-distance transmission.