Three classification of diesel engines according to speed

CLASSIFICATION OF MExANIMS

Transmision of motion  

• Lineal transmision- lever, puyey, block and tackle
• Rotary transmision- friction weels, belt drive, gears

Transformation of motion

• rotary lineal- weel, rack and pinion, nut and bolt
• reciprocating- Crank and rod, cranksalf, cam

Motion control

• direction control- ratxed, freeweel
• speed reduction- brake

Energy accumulation

• absorption/dissipation- spring

Connection

• linkage- clutx
• support- plain bearing

LEVERS

class 1: levers can do bot of tose ting, fulcrum is between te force and resistance 

class 2: levers increase te force3 tat we apply, te resistance is between te fulcrum and te force

class 3: levers increase te distance tat te end of te levers moves, te force is between t efulcrum and resistance 

ROTARY TRANSMISION: ay of tese mexanims keep te same speed rations, but eax one offers a different advantage. Metal xains are stronger and last longer tat rubber or plastic belts.

WORM DRIVE: reduces te speed of a rotary system very effectively.

ROTARY LINEAL TRANSFORMATION

wheel. Esential parts of bicycles, mor easly because they reduce our contact with the ground and decrease friction.

rack and pinion. The rack is bar with many teeth and the pinion is a gear with theet that interlock with the rack. Silding dorrs.

nut and bolt. Transform rotary motion into lineal motion. A bolt or saft with a spiral groove and nut that turns around it

winch and crank. Winch is a cylinder that rotates around a horizontal axis. We attach a rope to the winch and to a load. The crank rotate the winch.

RECIPROCATING ROTARY LINEAL TRANSFORMATION
crank and rod-. This mechanims is important for the first steam enisnes. Today we find cranks and rods in internal combustion engines, as well as windscreen wiper mechanims

crankshaft. We can connect multiple rods to one shaft. The rods are connected to cranks and the cranks are conected to the crankshalft. Crankshalf mechanims can syncronise the movement.

Cam. Is an irregurly shaped devce that rotates on a shaft. When the cam rotates it pushes a special bar called a follower. In toys.

RATCHEST is mechanims that controls the direction of motion. It allows motion in one direction, but not in the other. Watches.

BRAKES use friction to reduce speed. They are activated by some type of lever

• Disc brakes: disc connected to an axle
• Band brakes: a drum connected to an axle
• Drum brakes: a drum connected to an axle.

SPRINGS are flexible devices that absorb energy when apply force to them.Beds, sofas

• We push compression spring
• we pull on traction spring
• We bend torsion spring

BEARING

the support that holds a rotary shaft is called a bearing. It keeps the shaft in position

plain bearings are formed by two rings. One of the rings is connected to the rotary shaft and the other is connected to the support.