Because helical spiral bevel gear motor spiral bevel gears do not have the offset, they have less sliding between the teeth and are better than hypoids and produce less heat during operation. Also, among the main benefits of spiral bevel gears may be the relatively massive amount tooth surface that’s in mesh during their rotation. For this reason, spiral bevel gears are a perfect option for high rate, high torque applications.
Spiral bevel gears, like additional hypoid gears, are made to be what is called either correct or left handed. The right hand spiral bevel gear is thought as having the outer half of a tooth curved in the clockwise path at the midpoint of the tooth when it is viewed by looking at the facial skin of the gear. For a left hands spiral bevel gear, the tooth curvature would be in a counterclockwise path.
A gear 
drive has three primary functions: to improve torque from the generating equipment (electric motor) to the driven gear, to lessen the speed generated by the motor, and/or to improve the direction of the rotating shafts. The connection of the equipment to the gear box can be achieved by the usage of couplings, belts, chains, or through hollow shaft connections.
Acceleration and torque are inversely and proportionately related when power is held constant. Therefore, as speed decreases, torque increases at the same ratio.
The cardiovascular of a gear drive is obviously the gears within it. Gears operate in pairs, engaging one another 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, however, not axial loads. Spur gears have a tendency to be noisier than helical gears because they run with a single type of contact between the teeth. While the teeth are rolling through mesh, they roll from connection with one tooth and accelerate to get hold of with another tooth. This is unique of helical gears, that have more than one tooth connected and transmit torque more efficiently.
Helical gears have teeth that are oriented at an angle to the shaft, unlike spur gears which are parallel. This causes several tooth to communicate during operation and helical gears can handle having more load than spur gears. Due to the load sharing between teeth, this set up 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. Many enclosed gear drives use helical gears.
Double helical gears certainly are a variation of helical gears in which two helical faces are positioned next to each other with a gap separating them. Each encounter has identical, but opposing, helix angles. Having a double helical set of gears eliminates thrust loads and will be offering the possibility of even greater tooth overlap and smoother operation. Like the helical gear, double helical gears are commonly used in enclosed gear drives.
Herringbone gears are extremely similar to the double helical gear, but they do not have a gap separating the two helical faces. Herringbone gears are usually smaller compared to the comparable double helical, and are ideally suited for high shock and vibration applications. Herringbone gearing is not used very often because of their manufacturing issues and high cost.
While the spiral bevel gear is truly a hypoid gear, it is not always seen as one because it doesn’t have an offset between the 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 equipment 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. Generally, the spiral angle of a spiral bevel equipment is thought as the imply spiral angle.