SPUR GEAR

KIFAYAT ULLAHCU-499-2012

GEAR Gears are toothed members which

transmit power / motion between two shafts by meshing without any slip. In any pair of gears, the smaller one is called pinion and the larger one is called gear immaterial of which is driving the other.

CLASSIFICATION OF GEARS

SPUR GEARS Spur gears have their teeth parallel to

the axis and are used for transmitting power between two parallel shafts. They are simple in construction, easy to manufacture and cost less. They have highest efficiency and excellent precision rating. They are used in high speed and high load application in all types of trains and a wide range of velocity ratios.

Gear and pinion Spur gear

MANUFACTURING OF SPUR GEAR Plastic, brass, steel, & aluminum are the

materials generally used for manufacturing Spur Gears.

SOME SPUR GEAR MATERIALS 17-4 PH Stainless Steel 303 Stainless Steel Aluminum Anodized Brass Cast Polyurethane

MANUFACTURING PROCESSES Gear hobbing Gear shaping Broaching

GEAR HOBBING Sequential cuts are made into the work

piece by the cutting tool Most widely used process for making

spur and helical gears Comparatively quick and inexpensive

but quite accurate Most of the gears of different types can

be produced with the help of this process

GEAR SHAPING Cutting tool itself is a gear Teeth are formed by meshing the cutting

tool and the blank together The cutter is generally made of ASP

2030 carbon graphite Spur gears, helical gears and internal

spline

BROACHING In broaching the cut is made in one pass

making it very efficient This process uses a toothed tool called a

broach. A broach has a series of progressive

cutting edges The tool itself is very expensive Spur gears, helical gears , Internal

spline, slots

APPLICATIONS Spur gears are used in many devices

that you can see all over, like the electric screwdriver, dancing monster, oscillating sprinkler, windup alarm clock, washing machine and clothes dryer.

A spur gear is one of the most important ways of transmitting a positive motion between two shafts lying parallel to each other.

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