Spiral Bevel Gearboxes

    The spiral bevel gearboxes are the gearboxes that apply the spiral bevel gears inside the device. A spiral bevel gear is essentially the bevel gear with helical teeth. The primary application of a spiral bevel gearboxes is to regulate the speed output of an engine for one and to control the torque output of the engine for another. In the spiral bevel gearboxes, the direction of the engine drive shaft is turned ninety degrees to drive the wheels. The main advantage of applying the spiral bevel gear is that less vibration and noise are produced when the machine is running and the transmission of the driving force is more efficient.

    The gears are the fundamental and critical component of engines or other machinery. They lie between the engine and the wheels of a vehicle and manage the speed output and torque output of the machine. When the speed output is increased, the torque is reduced; on the other hand, when the torque output is increased, the speed of the machine slows down. There are gears with curved teeth or spiral teeth which look similar to those of a spiral bevel gear. Yet the way they work are different from each other and the advantages each of them has are different as well.

 


Advantages of spiral bevel gear

    The spiral bevel gears are the bevel gears with helical teeth that are positioned in a ninety degree angle in a gearbox. The helical teeth are the design with a slight curve to offer the better flexibility and traction of the movement. Without an offset design, the spiral bevel gears are less likely to slip during operation and hence a reliable transmission of the driving force is assured. Therefore, the spiral bevel gearboxes are ideal for high speed and high torque applications.

    The helical teeth of the spiral bevel gears provide the device with reliable tooth to tooth traction which reduces the backlash and chances of slipping of the gears. In addition, the helical teeth are evenly spaced so that the lubricate oil can be distributed more evenly inside the device and the overheating prevented. As a result, the spiral bevel gearboxes are able to provide a relatively longer lasting performance with minimal need for replacements or maintenance.

    In some cases, to further enhance the heat dissipation ability, the spiral bevel gears are made of hardened alloy steel. The steel-based alloys are ideal to offer a better level of strength while at the same time allow better heat dissipation. Since the tooth traction is smoother with the helical tooth design, it is easier for the tooth to slide in and engage with each other and therefore the engaging of the teeth is a lot quieter than the straight cut or spur-cut gears.

 


Helical gear

    Helical gears are also known as bevel gears. The spiral bevel gears that have the helical teeth are one of the main subtypes of helical gears. The helical teeth of the gears allow a smoother operation due to the angle twist that creates instant contact with the gear teeth. Generally speaking, the helical gears work more smoothly and quietly comparing to other types of gears due to the configuration of the gear teeth. The teeth of helical gear cut at an angle to the face of the gear.

    When the teeth on two helical gears start to engage with each other, the contact initiates gradually starting on one end of the teeth and keeping contact as the gears rotate into full engagement. The normal range of the helix angle is from fifteen to thirty degrees. The thrust load varies with the magnitude of tangent of helix angle. The thrust load is the force that is applied along an object’s axis. The helical gears can adjust the rotation angle by ninety degrees.

 


Bevel gear

    The main purpose of applying the bevel gear is to change the direction of a shaft’s rotation. Unlike the spiral bevel gears which only have spiral teeth, a regular bevel gear may have the teeth in straight, spiral or hypoid shape. The bevel gears with straight teeth are very different from those with spiral teeth. When the straight teeth bevel gears are operating, large impacts come along. The straight teeth bevel gears are more like the spur-cut gears in this way.

    On the other hand, the spiral bevel gears have the nature closer to the helical gears. The spiral bevel gears generate less impact and noise when operating. When two spiral bevel gears are working with each other, one of the gears rotates in the counter clockwise direction while the other rotates in the clockwise direction. Therefore, the rotation direction of the shaft is changed.

    The hypoid bevel gears are also a type of spiral bevel gears. The collaboration of hypoid bevel gears consists of one larger gear and one smaller gear. The larger gear is called the crown and the smaller gear is called the pinion. The hypoid gear places the pinion off-axis to the crown gear which allows the pinion to be larger in diameter and thus provide more contact area. The spiral angle of the pinion is usually larger than that of the crown gear. The hypoid bevel gears are ideal for power transmission because of the large gear ratios. These are the gears that have the similar configuration or layout to that in the spiral bevel gearboxes.

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