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:champagne::beer_mugs:MECHANISMS :beer_mugs::champagne: (balanced lever…
:champagne::beer_mugs:MECHANISMS :beer_mugs::champagne:
balanced lever
F· d= R · r
fixed pulley
F=R
mobveable pulley
F=R/2
friction drtives
N1·D1 = N2·D2 -> D1/D2=N2/N1
Gear mechanisms and cogwheels
N1·Z1=N2·Z2->Z1/Z2=N2/N1
N, and N, are the velocities of the corresponding wheels
Z , and Z, are the numbers of teeth.
worm gear
N
wheel
=(N
screw
·Z
grooves
)/Z
wheel
Gear mechanisms with a chain
N1· Z1 = N2· Z2->Z1/Z2=N2/N1
Gear train
N4/N1=(Z1·Z3)/(Z2·Z4)
Pulley trains with belts
N4/N1=(D1·D3)/(D2·D4)
Iv i and N, are the respective velocities of the drive and driven
pulleys.
De Dn Di and D, are the diameters of each wheel.
Uses: machine tools and dnlls
Rack and pinion system
L= P·Z·N
·
P is the distance between two consecutive teeth in millimetres.
• Z is the number of teeth in the pinion.
• N is the number of rotations per minute of the pinion
Winch and crank handle
F·d=R·r->F=R·(R·r/d)
• F is the force applied and R, the resistance.
• r is the radius of the winch and d, the length of the crank handle.
