Rotary Shock Absorber

What is a rotary shock absorber?

A rotary shock absorber, also known as a rotary damper, is a device that reduce the vertical and lateral motion in rail suspension applications by controlling the shaking and bouncing force of those applications. The rotary shock absorbers are one type of shock absorbers or shock dampers, which are widely used in industrial applications. A rotary shock absorber is able to prevent the wear of the device it works for through absorbing shock and providing force in order to decelerate the effects that too much vibration is possible to make.

When a device is working at a high speed, the friction between the device and the surface of what it contacts with, there would be friction that is produced in order not to keep the device from slipping out of the working site. Owing to the friction, the contact surfaces may gradually wear and be smoothed down, which make them difficult to maintain the friction when they are kept working. Therefore, the rotary shock absorber is used to grip the working device and keep it moving with appropriate speed and force, so as to prevent it from smoothing down and cause the failure of working.


What types of shock absorbers are there?

There are a variety of shock absorber that can be seen on the markets, and each of them can accommodate to different application so as to make the optimal effectiveness of the functions. According to the shapes of the shock absorbers, they can be categorized into two types, including rotary shock absorbers and linear shock absorbers.


Rotary shock absorbers

The rotary shock absorber come in circular surface. From the middle of the rotary shock absorber, there is a lever arm that controls the shacking and bouncing of the applied device. Across the lever arm are the stationary barriers that hold the lever arm in place. Under the stationary barriers, there are chambers that is filled with the fluids on the base, and a blade between the chambers and the stationary barriers. Around the whole components, there is a housing frame that holds everything inside firmly when the rotary shock absorber is operating. The rotary shock absorbers help devices that work with circulating by the centrifugal force, such as water pumps or clothes dryers, decelerate the vibration they might cause when they are working.


Linear shock absorbers

The linear shock absorber, as what the name implies, come in straight cylinders. Each of them consists of a couple of pistons, which are the working and dividing pistons, and a return mechanism for the piston. There would be hydraulic fluid or oil, which is not compressible, that is filled inside the cylinder. The orifices on the cylinder note the exponential intervals, where the piston is going to be slid to through the deceleration of the kinetic energy. The linear shock absorber can be applied with one or double units, so they can be further divided into the mono-tube shock absorbers and the twin tube shock absorbers.

● Mono-tube shock absorbers
A mono-tube shock absorber works with individual unit and is high-pressure gas shock. It is widely used because it can be mounted upside down or right side up, which accommodate to different forms of devices. The working tube, which is the individual pressure tube of a mono-tube shock absorber, is directly exposed to the air, and it is usually pricier than the other type that we are going to talk about. 

● Twin tube shock absorbers
A twin tube shock absorber consists of an internal tube and an external tube as a unit. The internal tube is the working tube, and the external tube wraps around the working tube, which make the hydraulic fluid reservoir. Depending on the strength of the functions, the twin tube shock absorber can also be differentiated in gas charged, position sensitive damping (PSD) and acceleration sensitive damping (ASD) shock absorbers.


How does a rotary shock absorber work?

Take the shock absorber that is applied in the tires, for example. The rotary shock absorber is operated with removing and converting the kinetic energy from the load being stopped into the thermal energy by the fluid inside the chambers, then decelerating it as heat. 

By the interaction of the rotating of the rotary shock absorber and the kinetic energy from the device that the rotary shock absorber is connected with, the kinetic energy is limited and would not propagate through the components of the device. Unlike the springs, which are also used for controlling vibration of what they work for, while after they absorb the kinetic energy from the other device, they would rebound it back to the device and cause vibration, the rotary shock absorber makes the energy accelerate by another form, and that’s why they are so popular in the industrial applications.

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