Here we classify the various gears from the aspect of gear drive.
1. When the two gears are engaged, the shaft of the gear is parallel to each other. We call it parallel axis gear transmission. Also known as spur gear drives (cylindrical gear transmission). Specifically divided into the following minor aspects.
(1). Spur gear drive
(2). Parallel shaft helical gear drive
(3). Herringbone gear transmission
(4). Rack and pinion drives
(5). Internal gear drives
2. When the two spindles are not parallel to each other, they are called intersecting shaft gear drive, also called bevel gear drive. Specifically, it is divided into:
(1).Straight bevel gear drives
(2). Helical bevel gear drives
(3). Spiral Bevel gear drives
3.When the two spindle space is intersecting, it is called skew gear drive
(1). Crossed-axis helical gears drive
(2). Hypoid gear drive
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