most commongearIt is a spur gear, which is used for large gear reduction.The teeth on spur gears are straight and mounted in parallel on different shafts.Spur gears are used in washing machines, screwdrivers, clockwork alarm clocks, and other appliances.Because the gears mesh and collide, each impact generates loud noise and causes vibration, which is why spur gears are not used in machinery such as automobiles.A normal gear ratio range is 1:1 to 6:1.
由于齿相互作用的原因，斜齿轮与正齿轮相比工作更平稳和安静。斜齿轮上的齿与齿轮表面成一定角度切割。当两个齿开始接合时，接触是逐渐的 – 从齿的一端开始并在齿轮旋转到完全接合时保持接触。典型的螺旋角范围约为15-30度。推力载荷直接随着螺旋角的切线的大小而变化。螺旋是变速器中最常用的齿轮。它们还产生大量推力，并使用轴承来帮助支撑推力负载。斜齿轮可用来将旋转角度调整90度。当安装在垂直轴上时。它的正常传动比范围是3：2到10：1。
Bevel gears are used to change the direction of rotation of the shaft.Bevel gears have straight, spiral or hypoid shaped teeth.Straight teeth and spur gears have similar characteristics, and they also have a great influence when meshing.Similar to spur gears, the normal transmission ratio range of straight bevel gears is 3:2 to 5:1.
Helical teeth operate the same as helical gears.They produce less vibration and noise than straight teeth.The right side of the helical ramp is the outer half of the tooth, inclined to travel clockwise from the axis plane.The left hand of the spiral bevel travels in a counter-clockwise direction.The normal gear ratio range is 3:2 to 4:1.
A hypoid gear is a helical gear whose shape is a revolving hyperboloid rather than a conical shape.Hypoid gears place the pinion gear on the ring gear or crown wheel.This allows the pinion to have a larger diameter and provide more contact area.
The pinion and the gear are always opposite, and the helix angle of the pinion is usually greater than the angle of the gear.Hypoid gears are used in power transmission systems due to their larger transmission ratios.The normal gear ratio range is 10:1 to 200:1.
Worm gears are used for large gear reductions.Gear ratios ranging from 5:1 to 300:1 are typical.The purpose of the setting is so that the worm can turn the gear, but the gear cannot turn the worm.The angle of the worm is shallow so the gears stay in place due to the friction between the two.The drive is suitable for conveyor belt systems, where the locking function can be used as a brake or as an emergency stop.