ME 212 Lecture 2: GEAR
Document Summary
They can also change the direction of the axis of rotation and can change rotary motion to linear motion. Types of gears: according to the position of axes of the shafts, parallel. Teeth is parallel to axis of rotation. Transmit power from one shaft to another parallel shaft. Used in electric screwdriver, oscillating sprinkler, windup alarm clock, washing machine and clothes dryer. The teeth on helical gears are cut at an angle to the face of the gear. This gradual engagement makes the helical gears operate much more smoothly and quietly than spur gears. To avoid axial thrust, two helical gears of opposite hand can be mounted side by side, to cancel resulting thrust forces. Herringbone gears are mostly used on heavy machinery. Rack and pinion gears are used to convert rotation (from the pinion) into linear motion (of the rack) A perfect example of this is the steering system on many cars.
