In hydraulic transmission, hydraulic oil cylinder is one of the most simple and relatively complete hydraulic transmission system, analyze its working process, can understand the basic principle of hydraulic transmission. Hydraulic system is mainly composed of: power element ( Oil pump) And actuators ( Oil cylinder or hydraulic motor) , control components ( All kinds of Industrial Valves) , auxiliary components and working medium of five parts. 1, the advantages of hydraulic transmission, 1) Small volume, light weight, so the inertial force is small, when overload or suddenly stop, don't happen big impact; ( 2) Within a given range steady automatically adjust the drawing speed, and can realize the infinite speed; ( 3) Commutation is easy, in the case of don't change the direction of motor rotation, work organizations can easily rotate and conversion of the straight line reciprocating movement; ( 4) Tubing connection between hydraulic pump and hydraulic motor, each other is not subject to strict limits on space layout; ( 5) Because use oil as working medium, components of relative movement between surface can self lubrication, wear small, long service life; ( 6) Operation control is simple, high degree of automation; ( 7) Easy to achieve overload protection. 2, the shortcomings of hydraulic transmission ( 1) Using hydraulic transmission to high maintenance requirements, working oil should always keep clean; ( 2) For hydraulic components manufacturing accuracy requirement is high, the technology is complex, high cost; ( 3) Hydraulic components maintenance is complex, and requires a higher level of technology; ( 4) Oil work medium, in the face of fire hidden danger; ( 5) The transmission efficiency is low.
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