Chapter 4 Hydraulic Actuators Chapter list 4.1 Hydraulic Motors 4.2 Hydraulic Cylinders Homepage List Upwards Dowrwards Retun Exit
Chapter 4 Hydraulic Actuators 1 4.1 Hydraulic Motors 4.2 Hydraulic Cylinders Chapter list
Chapter 4 Hydraulic Actuators The function of hydraulic actuators is to translate hydraulic energy of fluid into energy of the machine.They will drive the mechanism motion path like a straight,swing or rotation.The straight or swing are referred as hydraulic actuator or swing motion actuator,and the rotational motion is called hydraulic motor.The output parameters are force and speed or torque and rotating speed. Homepage List Upwards Downwards Retum Exit
Chapter 4 Hydraulic Actuators 2 The function of hydraulic actuators is to translate hydraulic energy of fluid into energy of the machine. They will drive the mechanism motion path like a straight, swing or rotation. The straight or swing are referred as hydraulic actuator or swing motion actuator, and the rotational motion is called hydraulic motor. The output parameters are force and speed or torque and rotating speed
Chapter 4 Hydraulic Actuators 4.1 Hydraulic Motors 4.1.1 Introduction 4.1.2 Operating principle of hydraulic motors 4.1.3 Low-speed motors 3 Homepage List Upwards Dowrwards Retun Exit
Chapter 4 Hydraulic Actuators 3 4.1 Hydraulic Motors 4.1.1 Introduction 4.1.2 Operating principle of hydraulic motors 4.1.3 Low-speed motors
Chapter 4 Hydraulic Actuators 4.1 Hydraulic Motors 4.1.1 Introduction The popular concept of a hydraulic motor is that it is nothing but a pump run backwards. 1.Characteristic parameters (1)Power and overall efficiencies The input power P of motor is: PMi =ApqM (4-1) The output powerP of the motor is: Ro=Tw×2n (4-2) The overall efficiency nof the motor is the ratio of PMo to P, 1M= (4-3) M 2=1门MmlN Homepage List Upwards Downward止 Return Exit
Chapter 4 Hydraulic Actuators 4 4.1 Hydraulic Motors 4.1.1 Introduction The popular concept of a hydraulic motor is that it is nothing but a pump run backwards. 1. Characteristic parameters （1）Power and overall efficiencies The input power of motor is: (4-1) The output power of the motor is: (4-2) The overall efficiency of the motor is the ratio of to , (4-3) P pq Mi M = M0 M 2π P T n = t M0 M Mm MV Mi P P = = PMi PM0 M PM0 PMi
Chapter 4 Hydraulic Actuators (2)Torques and mechanical efficiencies (a)The theoretic torque pqM=TMmo=TM2πn Or △pqM 2元n (4-4) (b)Startup torque TM-△TMs TMt TMt (4-5) 5 Homepage List Upwards Dowrwards Return Exit
Chapter 4 Hydraulic Actuators 5 （2）Torques and mechanical efficiencies （a）The theoretic torque Or （b）Startup torque M Mt Mt = = pq T T n 2π M Mt 2π p q T n = Ms Mt Ms Ms Mt Mt T T T T T − = = (4-4) (4-5)