Because spiral bevel gears do not have the offset, they have less sliding between the teeth and are better than hypoids and create less heat during operation. Also, one of the main advantages of spiral bevel gears may be the relatively large amount of tooth surface that’s in mesh during their rotation. For this reason, spiral bevel gears are a perfect option for high acceleration, high torque applications.
Spiral bevel gears, like additional hypoid gears, are made to be what’s called either right or left handed. The right hands spiral bevel equipment 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 equipment drive has three primary functions: to increase torque from the generating equipment (electric motor) to the driven equipment, to lessen the speed generated by the motor, and/or to change the direction of the rotating shafts. The connection of the equipment to the gear box can be accomplished by the use of couplings, belts, chains, or through hollow shaft connections.
Rate and torque are inversely and proportionately related when power is held constant. Therefore, as quickness decreases, torque increases at the same ratio.
The center of a gear drive is actually the gears within it. Gears run 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 end up being noisier than helical gears because they function with a single line of contact between tooth. While the teeth are rolling through mesh, they roll off of contact with one tooth and accelerate to get 
hold of with another tooth. This is helical spiral bevel gear motor unique of helical gears, that have more than one tooth in contact and transmit torque more smoothly.
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 enables helical gears to use smoother and quieter than spur gears. Helical gears produce a thrust load during procedure 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 where 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 offers the possibility of even greater tooth overlap and smoother procedure. Like the helical gear, double helical gears are commonly used in enclosed gear drives.
Herringbone gears are extremely like 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 fitted to high shock and vibration applications. Herringbone gearing is not used very often due to their manufacturing problems and high cost.
While the spiral bevel gear is actually a hypoid gear, it is not always seen as one because it doesn’t have an offset between the shafts.
One’s teeth on spiral bevel gears are curved and have one concave and one convex side. They also have a spiral position. The spiral angle of a spiral bevel gear is defined as the angle between the tooth trace and an component of the pitch cone, similar to the helix angle within helical gear teeth. Generally, the spiral angle of a spiral bevel gear is thought as the mean spiral angle.