MECHANISMS

They are part of machines and generally translate one kind of movement into another

• They make a job easier to do.• They involve a kind of force.• They involve some form of motion.

Types of motion

Linear:• movement in a straight line. Rotary:• movement in a circular direction.Reciprocating:• movement upwards and downwards in a straight line.Oscillating:• backwards and forwards motion along an arc.

Make a simple drawing of each of themGive an example of each of them in objects around usTranslate them into Spanish

TRANSMISSION MECHANISMS

They cause the transmission of rotation from one axle to another axle

The axle that produces the motion is called driver axle and the one that receives the motion, driven axle.

GEARS

Spur gears animation

When the first axle (the driver axle) rotates, the motion is transmitted to the second or driven axle.

It transmits rotation from one gear to another close gear.

The two gears rotate in opposite directions.

GEARS

It allows transmission between two perpendicular axles. Worm gear : The driver axle is always coupled to it. Regular gear : The worm axle transmits rotation to it.

It reduces the speed of the worm gear many times

WORM GEAR

The mechanism transmits rotation between perpendicular shafts

The gears have a cone-shape

BEVEL GEARS

Three or more single gears forming a chain of gears.

With three gears, driver and driven axles rotate in the same direction.

SIMPLE GEAR TRAIN

Two or more single gears are coupled to the same axle. This mechanism works as large multiplier or reducer of the speed.

COMPOUND GEAR TRAIN

It is made up of two grooved wheels linked by means of a tense belt.

If the pulley wheels are different sizes, the smaller one will spin faster than the large one.

BELT DRIVE (pulleys system)

Several pulleys are coupled in the same axle This mechanism works as large multiplier or reducer of the speed

COMPOUND BELT DRIVE

It is made up of two wheels in contact.

The two wheels rotate in opposite directions.

FRICTION DRIVE

It is made up of a chain that links the two toothed wheels.

Both wheels rotate in the same direction.

In some machines, the small wheel is called pinion, and the big one plate.

CHAIN DRIVE

TRANSFORM MECHANISMS

They cause the conversion from linear movements to rotations or vice versa.

It transforms the rotation of a crank into a linear, back-and-forth motion of a piston.

CRANK and SLIDER

crank and slider mechanism video

When a bolt is turning, its rotation generates a linear, forward motion.

This motion approaches or separates the bolt from a nut.

In other situations the nut, instead of the bolt, moves.

NUT AND BOLT

When the cam rotates, it makes the follower to go up and down.

CAM AND FOLLOWER

Cam and follower mechanism

It transforms the rotation of a small gear (pinion) to a forward motion of a toothed belt or a rack (or vice versa).

RACK AND PINION

Rack and pinion video