Because spiral bevel gears don’t have the offset, they have less sliding between the teeth and are better 
than hypoids and produce less heat helical spiral bevel gear motor during operation. Also, one of the main advantages of spiral bevel gears may be the relatively massive amount tooth surface that’s in mesh during their rotation. Because of this, spiral bevel gears are a perfect option for high speed, high torque applications.
Spiral bevel gears, like other hypoid gears, are designed to be what is called either right or left handed. The right hands 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 apparatus. For a left hand spiral bevel equipment, the tooth curvature will be in a counterclockwise direction.
A equipment drive has three primary functions: to increase torque from the generating equipment (motor) to the driven apparatus, to lessen the speed generated by the electric motor, and/or to change the direction of the rotating shafts. The connection of this equipment to the apparatus box can be accomplished by the utilization of couplings, belts, chains, or through hollow shaft connections.
Acceleration and torque are inversely and proportionately related when power is held constant. Therefore, as acceleration decreases, torque improves at the same ratio.
The heart of a gear drive is actually the gears within it. Gears run 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, however, not axial loads. Spur gears tend to become noisier than helical gears because they function with a single type of contact between tooth. While the teeth are rolling through mesh, they roll off of contact 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, unlike spur gears which are parallel. This causes more than one tooth to be in contact during operation and helical gears are capable of having more load than spur gears. Due to the load posting between teeth, this set up also allows helical gears to operate smoother and quieter than spur gears. Helical gears create a thrust load during operation which needs to be considered if they are used. The majority of enclosed gear drives use helical gears.
Double helical gears are a variation of helical gears where two helical faces are positioned next to one another with a gap separating them. Each encounter has identical, but opposing, helix angles. Employing a double helical group of gears eliminates thrust loads and offers the possibility of sustained tooth overlap and smoother operation. Just like the helical gear, double helical gears are commonly used in enclosed gear drives.
Herringbone gears are extremely similar to the double helical equipment, but they don’t have a gap separating both helical faces. Herringbone gears are usually smaller compared to the comparable dual helical, and are ideally fitted to high shock and vibration applications. Herringbone gearing isn’t used very often because of their manufacturing complications and high cost.
While the spiral bevel gear is actually a hypoid gear, it isn’t always seen as one because it does not have an offset between the shafts.
One’s teeth on spiral bevel gears are curved and have one concave and one convex side. There is also a spiral angle. The spiral angle of a spiral bevel equipment is defined as the angle between your tooth trace and an component of the pitch cone, like the helix angle found in helical gear teeth. Generally, the spiral position of a spiral bevel gear is thought as the indicate spiral angle.