Hydraulic Basic Training What is Hydraulic Why we

Hydraulic Basic Training

What is Hydraulic

Why we select Hydraulic ? • Strength Point – Big Power – Easy control • Weaken Point – – Energy loss Fire risk Leakage Change the motion according to temperature

Hydraulic Main Factor • P : Pressure (kgf/cm 2= bar, 1000 psi=70 bar) – Power control • Q : Pump flow (LMP= liter per minute) – Speed control • q : Pump displacement (용적, cc) • W : Work or weight (kgf or N) • A : 실린더 Area (cm 2)

Hydraulic Factor • T : Torque (Motor에 해당, kgfm or Nm) • Power : E-motor or Engine (k. W or HP) – 4 pole : 1, 800 rpm, 6 pole : 1, 200 rpm • V : flow velocity in Pipe (speed, m/sec) • v : viscosity (mm 2/s, c. St, VG)

Hydraulic Calculator • • P= W/A (kgf/cm 2) Q=V*A (V=실린더 속도, A=실린더면적) Q=q*rpm*n (n=pump volume 효율) HP= P*Q/(450*n), k. W=P*Q/(612*n) (n=E-Motor 효율)

Hydraulic Component • • Pump : Energy converter Valve : Controller Actuator : Mechanical motion Others : Accessory.

Hydraulic Factor • • Pump : Energy generator Relief : control power and safety Reducing : control the pressue Sequence and Counterbalance : control the motion • Flow : control the speed • Directional valve : control the front or back • Actuator : Motion

Hydraulic Factor • • Orifice : 일정한 유량 통과 Pilot : Signal 전달 Spring : force Spool or poppet or throttle: 유량 제어

Hydraulic Pump • Gear pump

Hydraulic Pump • Gear pump

Hydraulic Pump • Parker Gear pump – Al pump • PGP 503, 505, 511, 517 (Commercial 500 series) • P 16. 20. 25, (Gresen) • D, H series (Parker) – Iron pump (주물 pump) • • PGP 315, 330, 350, 365 (Commercial 300 series) PGP 430, 450, 465 PGP 030, 031, 050, 051, 075, 076 PGP 620, 640 (Commercial 600 series)

Hydraulic pump • How we can select?

Hydraulic pump • Vane pump Fixed

Hydraulic pump • Vane pump : Fixed

Hydraulic pump • Vane pump

Hydraulic pump • Vane pump : Variable

Hydraulic pump • Parker Vane pump – Fixed (Denison) • T 6, 7 series • Denison pump로써, 압력및 품질이 타사에 비해 경쟁력이 있으나, 가격은 다소 높은 상태임. – Variable vane pump • PVS series) • 냉각수용 pump로 사용중.

Hydraulic pump • How we can select?