Cardan shaft and coupling

There are many structural types of universal couplings, such as: cross shaft type, ball cage type, ball fork type, bump type, ball pin type, ball hinge type, ball hinge plunger type, three pin type, three fork rod type , three-ball pin type, hinged rod type, etc.; the most commonly used is the cross-axis type, followed by the ball cage type. In practical applications, according to the size of the transmitted torque, they are divided into heavy, medium, light and small.

Use of Universal joint

Mechanical parts used to connect two shafts (drive shaft and driven shaft) in different mechanisms to rotate together to transmit torque. In high-speed and heavy-load power transmission, some couplings also play the role of buffering, vibration reduction and improving the dynamic performance of the shaft system. The coupling consists of two halves, which are connected to the driving shaft and the driven shaft respectively. Generally, most power machines are connected to working machines by means of couplings.

Classification of Universal joint

There are many types of couplings. According to the relative position and position changes of the two connected shafts, they can be divided into: ①Fixed couplings. Mainly used in places where the two shafts require strict alignment and no relative displacement occurs during operation. The structure is generally simple and easy to manufacture, and the instantaneous speed of the two shafts is the same. It mainly includes flange couplings, sleeve couplings, and clamps. Shell coupling, etc. ②Removable coupling. It is mainly used where the two axes are deflected or have relative displacement during work. According to the method of compensating the displacement, it can be divided into rigid movable coupling and elastic movable coupling. Rigid movable couplings use the dynamic connection between the working parts of the coupling to have mobility in one or several directions to compensate, such as tooth couplings (allowing axial displacement), cross groove couplings Universal coupling (used to connect two shafts with small parallel displacement or angular displacement), universal coupling (used where the two shafts have a large deflection angle or have large angular displacement during work), gear coupling (allows comprehensive displacement), chain coupling (allows radial displacement), etc., elastic movable coupling (referred to as elastic coupling) uses the elastic deformation of elastic elements to compensate for the deflection and displacement of the two axes, while Elastic elements also have buffering and vibration-damping properties, such as serpentine spring couplings, radial multi-layer leaf spring couplings, elastic ring bolt couplings, nylon bolt couplings, rubber sleeve couplings, etc. . Some couplings have been standardized. When selecting, you should first select the appropriate type according to the work requirements, then calculate the torque and speed according to the diameter of the shaft, then find out the applicable model from the relevant manual, and finally make the necessary calculations for some key parts.

Function of Universal joint

It is used to connect two axes together. The two axes cannot be separated when the machine is running. The two axes can be separated only after the machine is stopped and the connection is disassembled.

Type of Universal joint

Due to manufacturing and installation errors, deformation after loading and the influence of temperature changes, the relative positions of the two shafts connected by the coupling will change, and strict alignment is often not guaranteed. Depending on whether the coupling has elastic elements, whether it has the ability to compensate for various relative displacements, that is, whether it can maintain the connection function under the condition of relative displacement, and the purpose of the coupling, couplings can be divided into rigid couplings. Flexible couplings and safety couplings. The main types, characteristics and functions of couplings in the transmission system. Note: Rigid couplings can only transmit motion and torque and do not have other functions, including flange couplings, sleeve couplings, clamps Flexible couplings such as shell couplings and other flexible couplings without elastic elements can not only transmit motion and torque, but also have varying degrees of axial, radial, and angular compensation performance, including gear couplings, Flexible couplings with elastic elements such as universal couplings, chain couplings, slider couplings, and diaphragm couplings can transmit motion and torque; they have varying degrees of axial, radial, and Angular compensation performance; also has varying degrees of vibration reduction and buffering effects to improve the working performance of the transmission system, including various non-metallic elastic element flexible couplings and metal elastic element flexible couplings, various elastic couplings The structures are different, the differences are large, and the functions in the transmission system are also different. Safety couplings transmit motion and torque, and provide overload safety protection. Flexible safety couplings also have varying degrees of compensation performance, including pin type, friction type, magnetic powder type, centrifugal type, hydraulic type and other safety couplings.

How to choose Universal joint?

The selection of couplings mainly considers the required speed of the transmission shaft, the size of the load, the installation accuracy of the two connected parts, the smoothness of rotation, price, etc. Refer to the characteristics of various types of couplings to choose a suitable one. Coupling type. Please contact Changyear to provide you with customized coupling solutions.