Clasification of mechanism

                            linear motion: Lever, pulley
Transmit motion
                          rotary motion: belt drive, gears

                             Rotary-linear: Wheel, rack and pinion
Transform motion
                            Recipocrating rotary-linear: Cam, crankshaft

                        Direction control: freewheel
Motion control
                        Speed reduction: brake

                             
Energy acumulation: absorption-disipation: spring.


                Linkage: clutch
Conection
                Support: plain bearing

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