Hypoid Gearbox


Cars have become one of the most inventions for modern human society. Back in the old days, humans have to take days, sometimes even months to travel from one place to another. After the invention of the cars, we can now travel and commute to the destination which is very far from where we live. The invention of the cars is a miracle. For humans used to be carried in the carriage which are made of wood. After industrialization, steam cars which are made of steel are created. This has transformed us from using animals to move the carriage to driving a mobile which is powered by coals. As the technology continues to progress, we are now having cars which are powered by engines and run with gasoline. The wonder never ceases. But there are thousands of components to make up a car, one of them is the discussion of today, the hypoid gearbox.

Bevel gearbox

Hypoid gearboxes can basically be classified as a bevel gearbox. What is the bevel gearbox actually? The bevel gearbox has its own name derived from the gear design which is used inside the gearbox. The bevel gearboxes are a type of gearbox which is usually provided with gear ratios within the range from 1:1 to 4:1. If needed, the bevel gearbox can also cover the fractional gear with the ratios of 1.5:1. The bevel gearbox is also a single stage unit. Bevel gearboxes are greatly utilized when a motor requires one drive line to power it, or in the case when a drive line needs to turn a corner. 

Hypoid gearbox

As I mentioned earlier, the hypoid gearbox can be viewed as a bevel gearbox. There is a unique characteristic of the hypoid gearboxes which helps them stand out from the other, it is that the axes of the hypoid gearbox are crossed on two parallel planes. Such feature has given the hypoid gearboxes an axis offset which are distinctive from the other bevel gearboxes. Depending on the conditions of the installed bevel gears, the rotation of the input and out shaft can either be in the same or the opposite direction.  

Advantages and disadvantages 

Thanks to the unique axis offset, the bevel pinion of the hypoid gearbox can achieve a greater spiral angle as one of the advantages. This has in turns enabled the overall coverage of the tooth to rise. And it is also this very reason that gives the hypoid gearboxes the ability to transmit more torque than a single helical tooth does. Because the coverage of the hypoid gearbox is wide, this has helped the hypoid gearbox to achieve in reaching the higher ratio. Another notable strength of the hypoid gearbox is it’s ability to remain silent. The downsides of the hypoid gearbox is that the friction loss will grow during the longitudinal sliding along the tooth length. This will in turns diminish the efficiency of the transmission. If the tooth surfaces of the hypoid gear box were to perform under high pressure and friction work, the oil film may be damage and the tooth surface will turn into a solid mass. In order for the hypoid gearbox to function, it requires the lubrication of the oil. This will help improve the strength of the oil film. 


So where do we put the hypoid gearbox to work? In the automotive industry, the hypoid gearbox has been put into great use. They are mostly equipped in the large truck, and are utilized in rear axles. The hypoid gearbox has it’s spiral angle located at the different location, as the left-hand spiral angle located on the pinion, and the right-hand spiral angle situated at the crown. This unique offset has helped the hypoid gearbox to have it’s driveshaft put in the lower part of the vehicle. This has in turn helped the vehicle reduce it’s chance to hinder the interior space. It is also possible to use the hypoid gearboxes when the desired speeds will exceed 1000 rpm. In the scenario of using the hypoid gearbox for a lower speed, the motion will need to be smooth. That is also the reason why the hypoid gearbox in the multi-stage gearboxes is usually used for the output stage. Because it can perform in a place where it requires high torques and a lower speed. 

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