FLUID POWER CONTROL ME604C

FLUID POWER Sources of Hydraulic Power ◦ Construction and working of pumps ◦ Actuators: Linear hydraulic actuators ◦ Fluid motors. Control Components: Direction control valve Flow control valves Electrical control -- solenoid valves. Relays, Accumulators and Intensifiers. MODULE:03 ~ HYDRAULIC SYSTEM COMPONENTS

FLUID POWER HYDRAULIC ACTUATORS ENERGY OF FLUID MECHANICAL ENERGY It performs useful work. Actuators

FLUID POWER HYDRAULIC ACTUATORS CLASSIFICATION: 1.Linear actuator: For linear actuation (hydraulic cylinders). 2. Rotary actuator: For rotary actuation

FLUID POWER HYDRAULIC ACTUATORS CLASSIFICATION: Rotary actuator: This name is reserved for a particular type of unit that is limited in rotation to less than 360, i.e., it can rotate clock / anti-clockwise but through less than one complete revolution.

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: It extracts energy from the fluid and convert it to mechanical energy to perform useful work in the form of continuous rotational motion. The hydraulic motors convert the input pressure to an equivalent torque while the inlet flow rate determines the motor speed.

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: Material-handling equipment, Farm tractors, Railway locomotives, Buses, Lawn mowers, and Machine tools Applications:

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: Applications: Hydraulic Impact Wrench Ideal for heavy duty drilling, loosening, and tightening operations

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: Applications: Double-drum rollers It uses hydraulics and a pair of hydraulic motors drives each drum virtually every aspect of its operation.

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: Applications: Maritime and Boat; & in suitable for other engineering applications

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: Applications: Hydraulic Post Hole Digger

FLUID POWER HYDRAULIC ACTUATORS Rotary actuator: Depending upon the mechanism employed to provide shaft rotation, hydraulic motors can be classified as follows : 1. Gear motors. 2. Vane motors. 3. Piston motors: Axial piston-type motors. Radial piston-type motors

FLUID POWER HYDRAULIC ACTUATORS GEAR MOTOR ~ Construction & working:

FLUID POWER HYDRAULIC ACTUATORS GEAR MOTOR ~ working:

FLUID POWER HYDRAULIC ACTUATORS GEAR MOTOR: Let’s summerise: 1.Develops torque due to hydraulic pressure acting against the area of one tooth. 2. The side load on the motor bearing is quite high, because all the hydraulic pressure is on one side. 3. Reversing the direction of flow can reverse the direction of rotation. 4.The gear motors are simple in construction and have good dirt tolerance, but their efficiencies are lower than those of vane or piston pumps and they leak more than the piston units.

FLUID POWER HYDRAULIC ACTUATORS VANE MOTOR ~ construction:  Vanes must have some means other than centrifugal force to hold themselves against the surface of the cam.  Spring or pressure loaded vanes are used.

FLUID POWER HYDRAULIC ACTUATORS VANE MOTOR ~ working:

FLUID POWER HYDRAULIC ACTUATORS VANE MOTOR ~ working:  Develops torque due to hydraulic pressure acting on the exposed surface of the vanes. System Pressure Pressure on this vane means a force The resulting force on the vane creates torque on the motor shaft

FLUID POWER HYDRAULIC ACTUATORS VANE MOTOR: Features: No side load for balanced design

FLUID POWER HYDRAULIC ACTUATORS PISTON MOTOR ~ classification: According to the piston of the cylinder block and the drive shaft, piston motors are classified as follows:  Radial piston motors.  Axial piston motors.  In-Line / Swash Plate design  Bent-Axis Design

FLUID POWER HYDRAULIC ACTUATORS In-Line PISTON MOTOR ~ construction :

FLUID POWER HYDRAULIC ACTUATORS In-Line PISTON MOTOR ~ working :

FLUID POWER HYDRAULIC ACTUATORS In-Line PISTON MOTOR ~ working :

FLUID POWER HYDRAULIC ACTUATORS Bent-Axis PISTON MOTOR ~ construction :

FLUID POWER HYDRAULIC ACTUATORS Bent-Axis PISTON MOTOR ~ working :

FLUID POWER HYDRAULIC ACTUATORS PISTON MOTOR ~ Features : These are available with both fixed-and variable- displacement feature types.

FLUID POWER HYDRAULIC ACTUATORS Radial PISTON MOTOR ~ working :

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: Motor Performance:

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: Motor Performance:

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: Theoretical Torque, Power, and Flow rate :

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: Problem: 01 A hydraulic motor has a 100 cm 3 volumetric displacement. If it has a pressure rating of 140 bar and receives oil from a m 3 /s theoretical flow rate pump, find the motor (a) speed, (b) theoretical torque, (c) theoretical kW power. ANS: N = 600 RPM, N m, 14 kW

FLUID POWER HYDRAULIC ACTUATORS Hydraulic motors ~ vs ~ Pumps

FLUID POWER HYDRAULIC ACTUATORS Hydraulic Motor: Hydraulic motors ~ vs ~ Electric Motor

FLUID POWER HYDRAULIC ACTUATORS MOTOR ~ Comparison : Gear MotorVane MotorPiston Motor Overall Efficiency 70-75%75-85%85-95% Operating Speed (rpm) Operating Pressure (bar)