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Mechanisms - Coggle Diagram
Mechanisms
Rotary motion mechanisms:Transmit motion and effort in a circular way.
Gear mechanisms and cogwheels: Sets of wheels that have cogs. One wheel moves another, they transmit a rotary motion that can be parallel, perpendicular or oblique. There are three types of gears:
Helical gear
Bevel gear
Spur gear
Friction drive: It's made up of two wheels. The first wheel is called primary drive wheel and the second, output wheel. When the first moves, it turns or drives causing the second to move
Pulleys with belts: Two pulleys or wheels which
rotate simultaneously because of a belt. The rotation is transmited by the connected pulleys. The two pulleys rotate in the same direction:
Worm gear: A screw that moves a helical cogwheel which is set perpendicular to the screw. When the screw rotates the gear moves at the same time as the teeth as grooves in the screw. It is used the reduce velocity.
Gear mechanisms with chain: Two cogwheels with parallel axles that rotate simultaneously.
Pulley trains with belts: This is a system with two or more pulleys where the rotaty motion is transmited via a stretched belt:
Gear train: This a system with more than two gears connected together.
Linear motion mechanisms:These transmit motion and force in a straight line
Fixed pulleys: A wheel that has a groove for a rope, chain or belt to go round it
Moveable pulleys: It has two pulleys, one is fixed while the other can move in a linear direction.
Levers: A rigid bar that is used with a point of support or a fulcrum. There are three types according to the position of the load and the effort applied in relation to the fulcrum
Class 3: The effort is between the fulcrum and the load.
Class 2: The load is between the effort and the fulcrum
Class 1: The load and the effort are on opposite sides of the fulcrum
Compound pulleys: combines fixed and moveable pulleys. It´s called block and
tackle
Mechanisms: are devices that transmit and convert forces and motions from a driving force to an output element. They enable us to
carry out certain tasks with greater comfort and less effort. Simple mechanisms are part of many mechanical objects, as the system of gears with a chain for bikes, the cogwheels of a clock, the lever of a seesaw or the pulley. The most important element in all of them is the motor. We can classify in two types.
To transmit of motion: We have linear or rotary motion.
To convert to motion: We have rotary to linear or rotary to reciprocating
Mechanisms that transform motion:
From rotary into linear motion:
Nut and bolt: Consists of a bolt or threaded bar and a nut. If the bolt rotates and the nut can't turn, the nut moves in a linear
motion along the threaded axle.
Winch (a crank handle): This is a a crank handle attached to the axle of a cylindrical drum. The crank is used to turn the winch
Rack and pinion: Uses a a pinion mounted on a rack. When the pinion rotated the rack advances in a linear motion:
From rotary into reciprocating motion:
Cam: A rotating shape that pushes a follower. This transforms rotary motion into reciprocating motion in the follower or bar.
Eccentric cam: It is formed by a wheel with an off-centre rotation axle. It transforms the rotary motion of the wheel into reciprocating
motion in the connecting rod
Crankshaft: A set of connecting rods attached to a jointed axle. This trasnforms rotary motion into reciprocating motion.
Crank-link-slide: It is composed of a crank and a rod called link or connecting rod. The rod has articulated joints at each end. This can transform reciprocating motion into rotary motion
