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# Mechanisms - description v3

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• 1. MECHANISMSThey are part of machines andgenerally translate one kind ofmovement into another• They make a job easier to do.• They involve a kind of force.• They involve some form of motion.
• 2. Types of motionLinear:• 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
• 3. TRANSMISSION MECHANISMSThey cause the transmission of rotation from one axleto another axleThe axle that produces the motion is called driveraxle and the one that receives the motion, drivenaxle.
• 5. GEARSWhen the first axle (thedriver axle) rotates, themotion is transmitted to thesecond or driven axle.It transmits rotation from onegear to another close gear.The two gears rotate inopposite directions.
• 6. WORM GEARIt allows transmission between twoperpendicular axles.Worm gear : The driver axle isalways coupled to it.Regular gear : The worm axletransmits rotation to it.It reduces the speed of the wormgear many times
• 7. BEVEL GEARS The mechanism transmits rotation between perpendicular shafts The gears have a cone- shape
• 8. SIMPLE GEAR TRAIN Three or more single gears forming a chain of gears. With three gears, driver and driven axles rotate in the same direction.
• 9. COMPOUND GEAR TRAIN Two or more single gears are coupled to the same axle. This mechanism works as large multiplier or reducer of the speed.
• 10. BELT DRIVE(pulleys system) 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.
• 11. COMPOUND BELT DRIVE Several pulleys are coupled in the same axle This mechanism works as large multiplier or reducer of the speed
• 12. FRICTION DRIVE It is made up of two wheels in contact. The two wheels rotate in opposite directions.
• 13. CHAIN 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.
• 14. TRANSFORM MECHANISMSThey cause the conversion from linearmovements to rotations or vice versa.
• 15. CRANK and SLIDERcrank and slider mechanism video It transforms the rotation of a crank into a linear, back-and- forth motion of a piston.
• 16. NUT AND BOLT 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.
• 17. CAM AND FOLLOWER Cam and follower mechanism When the cam rotates, it makes the follower to go up and down.
• 18. RACK AND PINION 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 video