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:<3: Mechanisms :<3: (Linear motion mechanisms (Levers descarga (F…
:<3: Mechanisms :<3:
Linear motion mechanisms
Levers
F is the force or effort applied at one end of the bar
R is the resistance or load which acts at the other end of the bar
d is the distance from F to the fulcrum
r is the distance from R to the fulcrum
Fxd=Rxr . This is the law of the lever
Fixed pulley
Is balanced when the efford F is iqual to the resistance of the load. F=R
Movable pulley
A moveable pulley is balanced when it satifies this equation: F=R/2
Compound pulley
This is a system of fixed and moveable pulleys, often called block and tackle
Rotary motion mechanisms
They include friction drives
It is expressed by the following equation: N1xD1=N2xD2 -> D1/D2= N1/N2
Gear mechanisms and cogwheels
N1xZ1=N2xZ2 -> Z1/Z2=N1/N2
N=NxZ/Z
N4/N1=Z1xZ3/Z2xZ4
N4/N1=D1xD3/D2xD4
Mechanisms that transform motion
From rotary into linear
Rack and pinion system
L=PxZxN
Nut and bolt system
Winch and krank handle
Fxd=Rxr -> F=RxRxr/d
From rotary into reciprocating motion
Crank-link-slider
Krankshaft
Cam
Eccentric cam
Other mechanisms
Mechanisms for controlling and directing motion
Disc brakes :
Band brakes
Drum brakes
Mechanisms that store energy
Compression
Traction
Torsion
Connecting mechanisms
Clutches
Fixed connections
Movable connections
Supports: bushings and bearing
