Konsep Hidrolik

dan penggunaan tekanan pada fluida

Sifat penting tekanan pada fluida

• Fluida akan meneruskan tekanan ke semua bagian , dengan mengabaikan bentuk wadahnya

• Sebuah gaya dapat diterapkan dapat diterapkan kapan saja di inginkan

• Gaya dapat berlipat bergantung luas area kontak dari piston yang di pergunakan untuk menekan air

Penerapan penggunaan hidrolik

• Rem Mobil• Dongkrak • Fork lift• Lift• Bulldozer• Kamera Televisi

Bagaimana Rem Mobil Bekerja• Sebuah gaya yang cukup kecil

diterapkan pada pedal rem yang akan menekan piston pada area yang cukup kecil

• Piston akan menekan cairan rem• Tekanan akan menyebar ke seluruh

bagian minyak rem• Tekanan akan bekerja pada empat

piston dengan area yang lebih besar dan melipat gandakannya

• Sebagaimana tekanan yang terdistribusi merata, rem akan bekerja dengan kekuatan yang sama

Hydraulic brake• The diagram shows a

simple brake where a pedal will push down on the smaller master piston

• The force pushing down will put the liquid under pressure

• The pressure is transmitted through the liquid and against the slave piston

• The pressure causes the slave piston to exert a force where it is needed

Using the formula P=F/A

• What is the pressure exerted on the liquid by the slave piston?

Answer:Pressure = 10N / 5cm2 = 2 N/cm2

• Calculate the area of the slave piston that will lift a 100N load

Answer:Area = force / pressure = 100N / 2 N/cm2

Master PistonIs 5 cm2

10N

Slave piston

More questions on hydraulics

1. What will the force (F1) need to be to exert a pressure of 20 N/cm2 ?

2. Calculate the weight (F2) that can be lifted by the slave piston.

Answers: 1. Force = 20 N/cm2 x 10cm2 = 200N 2. Force = 20 N/cm2 x 100cm3 = 2000N

Master piston = 10cm2 Slave piston

= 100cm2

Summary of the principles of hydraulics

• Pressure is transmitted throughout a liquid• A force may be applied anywhere to the liquid• All hydraulic systems use a small master piston and

a large slave piston• A small force is used to create a very big force• The small master piston is used to apply a force• The slave piston is always bigger than the master

piston• The larger slave piston will multiply the original

force put on the master piston

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