Hollow Shaft Reducer

What is a hollow shaft reducer?

A hollow shaft reducer, also known as a hollow shaft gearbox, or a hollow shaft gear reducer, is a type of gear reducer. The hollow shaft reducer owns hollow output shaft within the construction, which allows the power transmission process more efficient. In terms of the function of a reducer, it is dedicated to increase the torque while regulates the speed of the output. 

Besides, what makes this type of reducer efficient should thank to the design of the shaft. With the hollow output shaft, the space is the less affective factor regarding the installation process. In addition, the hollow shaft performs its function with relatively lower weight, and thus reduces the entire weight of the reducer accordingly.


The material choices of shafts for reducers

The shafts applied for the reducers are usually made of stainless steel, carbon steel, or aluminum. Some of them are coated with other metal alloys, while others are not, as them have already had the required properties for proper use. 

When the durability is what you may concern, the stainless steel shafts own the optimal ability in corrosion resistance. Considering the reduction of cost, the shafts made of carbon steel is less expensive while still resists to corrosion as well. As for the aluminum shafts, it weights the lightest among the three, and ensures the stiffness and strength when they are coated with ceramic.


The design of a hollow shaft reducer

● Concentric configuration
Today's concentric shaft reducer designs have changed the playing field for high torque drive configurations. With the concentric design of the reducer, the transmission process can be more easily generated in the controlled manner. This results in the improvement of efficiency and the strength of the hollow shaft reducer itself.

This type of configuration is often compared with the eccentric reducers. Instead of enabling the vertical mounting of shafts, the eccentric reducers are formed depending on the construction of related applications. Since the concentric type offers more power per dollar than other high-torque drives, making them an economic contender for the most demanding factory tasks.

● Angular orientation
When it comes to shaft orientation for reducers, the parallel and right angle forms must first come up in your mind. The parallel orientation indicates the input and output shafts are arranged parallel, which makes the power transmission in lines. As for the right angle one, it is suitable for the applications that have space limits within the construction. 

No matter the parallel or right angle form, the hollow shaft reducer often comes in worm gear design. The worm gear design refers to one threaded screw and one worm gear that attach to each other. When in conjunction with other equipments, which including the shafts, they together comprise the complete construction of the reducer. These two parts, which are called the worm screw and worm wheel, in the worm gear reducer, are in charge of the regulating of the torque and speed.  When the worm wheel turns, it would drive the worm screw to rotate, and the rotary motion of them thereby results in the movement of the shafts.

In most cases, the right angle hollow shaft reducer with worm gear design is the preferable one in the realm of power transmission. In addition to the mechanism in vehicles, which is what the gear reducers are most commonly applied for, even a small part on a machine tool would require the assistance of the reducer. As there is the need for motion transmission and the restriction of space appears at the same time, the manufacturers would prefer the angular orientation rather than the parallel one.

Before choosing a parallel reducer, you should make sure if the internal construction can accept the inline orientation. In contrast, with a right angle reducer, it helps reduce the total length that it takes up within the device. Therefore, considering the coordination of the mechanism, a right angle arrangement is usually the better choice for the worm gear hollow shaft reducer.


Why choose hollow shafts over solid shafts?

Tracing back to the shaft design, since there is hollow shafts, there would be the solid counterparts of them. As the name implies, the main difference between these two types of shafts is in the center part of the shaft. While the reason why some may prefer the hollow form over the solid one can be seen in the following factors, including:

● Strength
Comparing these two that come in the same weight, the hollow shafts are more powerful than the solid shaft, which ensures high performance of the hollow shaft reducer. 

● Stiffness
At the same time, since the hollow shafts are able to withstand more external force when compared to the solid shafts with the same weight, the stiffness of them would be relatively higher than their counterparts.

● Ease of power transmission
With the better strength and stiffness, the hollow shafts perform better in withstanding the external forces. In addition, the hollow opening makes them easier to connect to the relevant applications, which thus results in the increasing of effectiveness in power transmission.

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