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JSS2 Basic Technology Lesson Note on Gear Drive

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TOPIC: GEAR DRIVE

CONTENT:

Gear drive
Seizure
Types of gears
Uses of gear
Power transmission.
Changing direction,
Selecting speed
functions of lubricants in gears
importance of applying lubricants to gears

SUB TOPIC ONE (1) Gear drive

This is a device used to transmit motion between parallel or inclined shafts that are close to each other (such that the tooth on the wheel mounted on the shafts mesh together). When two gears are in mesh, they are called GEAR TRAIN. Friction always occurs between the meshed teeth of the gear train. Constant lubrication is therefore necessary to prevent wearing. The teeth on each gears in mesh must be uniformly spaced around the gear (that is symmetrical) for them to mesh properly and to prevent damage of the tooth. Improperly meshed gears can also lead to seizure of the gear train.

Seizure is the total movement stoppage of the gear train.

Unlike the belt and the chain drive, the driver and the driven gear move in different direction. To make the driver and the driven gear move in the same direction, another gear (called the IDLER) is inserted between the two (driver and the driven gear).

Types of gears

Spur gear: this has teeth parallel to the shaft of the gear.
Helical gear: this has teeth inclined to the shaft of the gear.
Worm gears: these are gears formed when a spur gear mesh with a screw.
Rack and pinion: these are gears that run on a flat toothed rack.
Planetary gears: these consist of a number of spur gear meshed with one another and another gear with internal gear.
Bevel gears: these are gears used when power is to be transmitted between inclined shafts