Because spiral bevel gears do not have the offset, they have less sliding between your teeth and are more efficient than hypoids and create less heat during procedure. Also, among the main advantages of spiral bevel gears is the relatively massive amount tooth surface that is in mesh throughout their rotation. For this reason, spiral bevel gears are a perfect option for high velocity, high helical spiral bevel gear motor torque applications.
Spiral bevel gears, like other hypoid gears, are made to be what’s called either correct or left handed. A right hand spiral bevel gear is defined as having the outer half a tooth curved in the clockwise path at the midpoint of the tooth when it’s viewed by searching at the face of the apparatus. For a left hand spiral bevel gear, the tooth curvature would be in a counterclockwise direction.
A equipment drive has three main functions: to improve torque from the traveling equipment (motor) to the driven equipment, to reduce the speed generated by the motor, and/or to change the path of the rotating shafts. The connection of this equipment to the apparatus box can be achieved by the use of couplings, belts, chains, or through hollow shaft connections.
Swiftness and torque are inversely and proportionately related when power is held continuous. Therefore, as velocity decreases, torque improves at the same ratio.
The heart of a gear drive is actually the gears within it. Gears work 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 produce radial reaction loads on the shaft, but not axial loads. Spur gears tend to end up being noisier than helical gears because they operate with a single type of contact between the teeth. While the the teeth are rolling through mesh, they roll from contact with one tooth and accelerate to contact with another tooth. This is unique of helical gears, that have more than one tooth in contact and transmit torque more efficiently.
Helical gears have teeth that are oriented at an angle to the shaft, as opposed to spur gears which are parallel. This causes more than one tooth to communicate during operation and helical gears can handle holding more load than spur gears. Due to the load sharing between teeth, this arrangement also allows helical gears to use smoother and quieter than spur gears. Helical gears produce a thrust load during operation which needs to be considered if they are used. Most enclosed gear drives use helical gears.
Double helical gears 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 opposite, helix angles. Having a double helical group 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 generally found in enclosed gear drives.
Herringbone gears are very like the double helical gear, but they 
do not have a gap separating both helical faces. Herringbone gears are usually smaller compared to the comparable dual helical, and are ideally suited for high shock and vibration applications. Herringbone gearing is not used very often due to their manufacturing issues and high cost.
As the spiral bevel gear is truly a hypoid gear, it is not always considered one because it doesn’t have an offset between your shafts.
One’s 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 thought as the angle between your tooth trace and an component of the pitch cone, like the helix angle within helical gear teeth. In general, the spiral angle of a spiral bevel equipment is defined as the imply spiral angle.