Universal couplingAs a type of coupling, using the characteristics of its mechanism, the driving shaft and the driven shaft are not on the same axis, and the two connected shafts can be continuously rotated under the condition of the axis angle, and the torque and movement can be reliably transmitted.Compared with ordinary couplings, the most prominent feature of universal couplings is that the universal coupling structure has greater angular compensation capability, compact structure, and high-efficiency transmission efficiency.
With its superior performance, universal couplings have achieved considerable market sales, and many types of universal couplings have also appeared on the market.So how to choose the right coupling?Among them, the cross-shaft universal coupling is the universal coupling with a large amount, and the bearing of this universal coupling is the most vulnerable component.Generally speaking, the car will use the ball cage universal coupling.For agricultural machinery, industrial machinery and other sports machinery, special universal couplings will be used,Universal couplingMost equipment will use a cross shaft universal coupling.
How to hot install the cross shaft universal coupling?
XNUMX. Preparation before hot loading
Fill the matching part of the journal and the cross shaft universal joint with gasoline or kerosene and scrub it clean.If there is roughness or damage, it needs to be removed with oilstone or fine diamond gauze. Of course, other methods can also be used.Then use a micrometer to measure the inner diameter of the journal, and a micrometer to measure the inner diameter of the cross shaft universal coupling.When measuring couplings, at least3 points, and repeated measurement, if the processing results do not meet the requirements of the drawing, use a scraper or a half-round file to repair the inner hole.
Second, hot loading
After preparing the work, start the hot-installation, and it is required to be fast, so as not to complete the hot-installation, the temperature will drop, resulting in the shrinkage of the cross-shaft universal coupling's aperture, making it difficult to install.General hot-loading cross shaft typeUniversal couplingThe universal joint will heat the temperature to250°C.The heating temperature should not be too fast, so as not to affect the uniformity of the coupling temperature. As for the heating time, it should be determined according to its expansion.In order to obtain a reasonable inner diameter of the coupling, a measuring stick of the same size can be made according to the measured heating expansion value, and the measuring stick can be heated until the measuring stick can be put into the inner diameter hole.Then proceed to the hot-sleeve work.
The surface of the cross universal joint should be carburized and quenched or tempered. The hardness of the obtained surface is different depending on the method.Gas carburizing Put the workpiece into a closed carburizing furnace, and use gas (methane, ethane, etc.) or liquid carburizing agent (kerosene or benzene, ethanol, acetone, etc.) to obtain a high-carbon surface layer.Solid carburizing is to put the workpiece and solid carburizing agent (composed of charcoal and accelerator) in a sealed box, and heat it to the carburizing temperature in a heating furnace, and keep it for a certain period of time to make the activated carbonUniversal couplingThe penetration of atoms into the surface of the workpiece is also the earliest carburizing method.
The cross-shaft universal coupling is a general-purpose component of mechanical foundation. It is suitable for two shafts whose axis is deviated and whose relative position changes frequently.The biggest advantage of the cross-shaft universal coupling is that it has large torque transmission, angular compensation capability and compact structure.
The structure principle of the cross shaft universal coupling:
The cross piece on the main and driven shafts and the middle cross shaft are respectively connected by hinges. When there is an angular displacement between the two shafts, the shaft forks rotate around their respective fixed axes, so that the cross shaft can move in space.
Movement analysis of cross shaft universal coupling:
When the inter-axis angle between the two shafts is not zero, the actual rotation angle between the rotation angle of the active shaft and the rotation angle of the driven shaft at any instant: The plane comes from the driving shaft 1, which is the movement plane on the driving shaft fork 1, and the plane is perpendicular to the driven shaft 3, which is the movement of point C on the driven shaft fork.
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