Basic HydraulicFundamentals of HydraulicPage 1/16 Hands-on Training Fundamentals of Hydraulic Basic Hydraulic.

Presentazione sul tema: "Basic HydraulicFundamentals of HydraulicPage 1/16 Hands-on Training Fundamentals of Hydraulic Basic Hydraulic."— Transcript della presentazione:

1 Basic HydraulicFundamentals of HydraulicPage 1/16 Hands-on Training Fundamentals of Hydraulic Basic Hydraulic

2 Fundamentals of HydraulicPage 2/16 Contents Topic 1. Pressure 2. Flow and Pressure 3. Merit & Demerit 4. Oil

3 Basic HydraulicFundamentals of HydraulicPage 3/17 1. Atmospheric Pressure2. Seawater Pressure 3. Tap Water Pressure 1.Pressure 1) Pressure in our ordinary life

4 Basic HydraulicFundamentals of HydraulicPage 4/17 Pascal's Law. P F A P = Pressure.Kg/cm2 F = Force.Kg A= Areacm2 P= F A or F= P X A

5 Basic HydraulicFundamentals of HydraulicPage 5/17 Pressure Static fluid Right angle Equal strength Transmittance of strength 1. Pressure 2) Pressure in Confined and Static Fluid

6 Basic HydraulicFundamentals of HydraulicPage 6/17 Pressure Pressure = 1 N 1 m2 Newton and Pascal Force (F) = 1 kg x 1 m/sec2 = 1 Newton (N) = 1 Pascal (Pa) On the earth Force (F) = 1 kg x 9.81 m/sec2 = 1 kgf Pressure = 1 kgf 1 cm2 = 1 kgf / cm2 1 kgf = 9.81 N 1,000 Pa = 1 kPa 1,000,000 Pa = 1MPa 1 kgf / cm2 = 9.81N 100 x 100/ m2 = 98,100 Pa 1 kgf / cm2 = 98.1 kPa = 0.0981 MPa 1. Pressure 3) Unit of Pressure Pressure = Area Force Area (m 2 ) Force (Newton) Universal GravityGravity force

7 Basic HydraulicFundamentals of HydraulicPage 7/17 Cylinder A Cylinder B Area 1 cm 2 Area 10 cm 2 Pushing force 10kgObtainable force 100kg Pressure 10kg/cm2 Pressure 10kg/cm2 1. Pressure 4) Force Amplification

8 Basic HydraulicFundamentals of HydraulicPage 8/17 Cylinder A Cylinder B Area 1 cm 2 Area 10 cm 2 Pushing force 10kgObtainable force 100kg Pressure 10kg/cm2 Pressure 10kg/cm2 Large Small 1. Pressure 5) Distance Reduction

9 Basic HydraulicFundamentals of HydraulicPage 9/17 Pressure = Zero 1. Pressure 6) No Pressure without Resistance

10 Basic HydraulicFundamentals of HydraulicPage 10/17 Weight Pressure is created 1. Pressure 7) Pressure with Resistance

11 Basic HydraulicFundamentals of HydraulicPage 11/17 Weight 1. Pressure 8) Difference Pressure with Throttle Throttle or Variable Orifice

12 Basic HydraulicFundamentals of HydraulicPage 12/17 Gauge Pressure Vacuum Atmospheric pressure Gauge Pressure Negative Gauge Pressure Zero 1. Pressure 9) Gauge pressure

13 Basic HydraulicFundamentals of HydraulicPage 13/17 2. Flow and Pressure Q = Flow rate : liter / min High pressure Low speed Large area Small area High speed Low pressure Same Flow Rate Pressure AreaSpeed Weight V S C = 0.16 m/sec V (m/sec) = C x Q / S

14 Basic HydraulicFundamentals of HydraulicPage 14/17 3. Merit and Demerit of Hydraulic Merit 1. Design is simpler 2. Flexibility 3. Quiet 4. Stepless control 5. High efficiency 6. Easy system protection Demerit 1. Expensive 2. Sensitive to dirt 3. Need oil change 4. Oil leak possibility

15 Basic HydraulicFundamentals of HydraulicPage 15/17 4. Hydraulic Oil 1) Function of Hydraulic Oil 1. To transmit power 2. To lubricate 3. To cool 4. To clean 5. To seal

16 Basic HydraulicFundamentals of HydraulicPage 16/17 4. Hydraulic Oil 2) Komatsu Recommended Oil

17 Basic HydraulicFundamentals of HydraulicPage 17/17 4. Hydraulic Oil 3) Viscosity What is the Viscosity of Oil? 2. Viscosity change Low temperature High viscosity High temperature Low viscosity 3. Viscosity grade comparison SAE ViscosityISO Viscosity 15wVG46 KOMATSU HO46-HM = = 1 - Much leakage 2 - Low performance 3 - Low pressure 3 Negative points 1. Viscosity = Thickness of oil