Because spiral bevel gears don’t have the offset, they have less sliding between your teeth and are better than hypoids and produce less heat during procedure. Also, among the main benefits of spiral bevel gears is the relatively massive amount tooth surface that is in mesh during their helical spiral bevel gear motor rotation. Because of this, spiral bevel gears are an ideal option for high swiftness, high torque applications.
Spiral bevel gears, like additional hypoid gears, are made to be what is called either correct or left handed. The right hands spiral bevel gear is thought as having the outer half a tooth curved in the clockwise direction at the midpoint of the tooth when it is viewed by looking at the face of the apparatus. For a left hands spiral bevel gear, the tooth curvature would be in a counterclockwise direction.
A equipment drive has three primary functions: to increase torque from the driving equipment (electric motor) to the driven gear, to reduce the speed generated by the motor, and/or to improve the direction of the rotating shafts. The connection of this equipment to the gear box can be achieved by the use of couplings, belts, chains, or through hollow shaft connections.
Quickness and torque are inversely and proportionately related when power 
is held constant. Therefore, as swiftness decreases, torque boosts at the same ratio.
The cardiovascular of a gear drive is obviously the gears within it. Gears operate in pairs, engaging each other to transmit power.
Spur gears transmit power through shafts that are parallel. The teeth of the spur gears are parallel to the shaft axis. This causes the gears to create radial response loads on the shaft, but not axial loads. Spur gears have a tendency to end up being noisier than helical gears because they run with a single type of contact between teeth. While the teeth are rolling through mesh, they roll off of connection with one tooth and accelerate to contact with another tooth. This is unique of helical gears, which have more than one tooth connected and transmit torque more smoothly.
Helical gears have teeth that are oriented at an angle to the shaft, in contrast to spur gears which are parallel. This causes more than one tooth to communicate during procedure and helical gears are capable of having more load than spur gears. Due to the load posting between teeth, this arrangement also allows helical gears to operate smoother and quieter than spur gears. Helical gears produce a thrust load during operation which needs to be considered when they are used. The majority of enclosed gear drives make use of helical gears.
Double helical gears are a variation of helical gears in which two helical faces are placed next to one another with a gap separating them. Each face has identical, but opposing, helix angles. Employing a double helical group of gears eliminates thrust loads and offers the possibility of even greater tooth overlap and smoother procedure. Just like the helical gear, dual helical gears are commonly used in enclosed gear drives.
Herringbone gears are very similar to the double helical gear, but they don’t have a gap separating the two helical faces. Herringbone gears are typically smaller than the comparable double helical, and so are ideally suited for high shock and vibration applications. Herringbone gearing is not used very often due to their manufacturing difficulties and high cost.
As the spiral bevel gear is actually a hypoid gear, it isn’t always seen as one because it does not have an offset between your shafts.
The teeth on spiral bevel gears are curved and also have one concave and one convex side. They also have a spiral angle. The spiral angle of a spiral bevel gear is defined as the angle between the tooth trace and an element of the pitch cone, similar to the helix angle within helical gear teeth. In general, the spiral position of a spiral bevel equipment is thought as the indicate spiral angle.