The Choice of Cardan Shaft and the Cause of Unbalance

The Choice of Cardan Shaft and the Cause of Unbalance


Cardan shaft is used to connect two shafts together so that the two shafts cannot be separated when the machine is working. Only when the cardan shaft is taken down can the two shafts be separated.

There are many kinds of cardan shafts. When selecting the application, the cardan shaft needs to transfer the actual rotation speed of the shaft, how much load it can bear, the installation accuracy required to connect the two shafts, whether the shaft is stable and won't shake when rotating, the purchase price, etc. When purchasing, users need to understand the performance of cardan shaft and their respective characteristics and adopt a cardan shaft suitable for their own equipment. If you choose to use it after purchase, you should give feedback to the manufacturer in time if you have any problems, and do not wait for the final equipment strike to repair. In fact, the best thing is to describe clearly the requirements of the equipment as the manufacturer when purchasing, so that the manufacturer can make a reasonable recommendation.

Cardan shaft is used to realize the continuous rotation of two shafts of different mechanisms, and it can reliably transmit torque and motion of mechanical cardan shaft parts. The feature of the mechanism is that the two axes are not on the same axis, and there is an included angle with the axis. The biggest characteristic of cardan shaft is that it has large angular compensation ability, compact structure, and high transmission efficiency. During the operation of cardan shaft, the transmission imbalance or vibration is often encountered. In order to improve the transmission efficiency of cardan shaft and make it work smoothly, it is necessary to understand why such a phenomenon occurs, so as to find solutions.


Causes Affecting the Unbalance of Cardan Shaft:

1. There is a deviation in the design of parts, or the material is unqualified, or the wear is uneven.

2. The centering surface of the universal joint and the shaft is eccentric, resulting in imbalance.

3. The gap between parts of the universal joint is unreasonable, or the distribution of accessories is uneven and asymmetric.


The Reasons for the Vibration of Cardan Shaft are as Follows:

1. The balance sheet is not compensated by the action balance.

2. The universal joint is not on the same plane.

3. The cardan shaft has broken the original dynamic balance.

4. Worn splines or excessive clearance.

Cardan shaft is a kind of transmission parts. It makes use of the characteristics of its mechanism to make the two shafts, not on the same axis and turn continuously at a certain angle. The biggest characteristic of cardan shaft is that it has large angular compensation ability, compact structure, and high transmission efficiency. There are many types of cardan shafts, among which the cross shaft type is the most common and the ball cage type is the second. In practical application, Cardan coupling can be divided into heavy, medium, light, and small according to its transmission torque. In order to better use the cardan shaft, it is necessary to know what conditions will cause damage.

1. Human factors: improper selection, low machining accuracy of Cardan shaft, poor maintenance, poor alignment, etc.

2. Environmental factors: corrosion caused by the deterioration of lubricating oil, corrosion caused by acid and alkali gas, etc.

3. Damage caused by wear: the cardan shaft runs continuously in the machine, and the components in relative motion are worn.

4. Cardan shaft and fracture: the fatigue limit of Cardan shaft is exceeded, resulting in component fracture.

5. Connecting bolt: improper design, selection, and installation of connecting bolt.

Coupling is a kind of mechanical part used to connect the driving shaft and driven shaft in different mechanisms and make them rotate together to transmit torque. In high-speed and heavy-duty power transmission occasions, some couplings can also play the role of buffering, damping, and improving the dynamic performance of shafting. The coupling is composed of two parts, which are respectively connected with the driving shaft and the driven shaft. Generally, the power machine and the working machine will not be directly connected but will be connected with the working machine by means of the coupling.

As a special kind of coupling, cardan shaft, because of its structural characteristics, makes the driving shaft and the driven shaft not in the same axis, and can realize the continuous rotation of the connected two shafts when there is an angle between the axes, and reliably transfer torque and motion. The biggest difference of cardan shaft lies in its large angular compensation capacity, compact structure, and high transmission efficiency. That's why cardan shafts are so popular.


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