Hot Installation Cross Shaft Universal Coupling
As a kind of coupling, universal coupling uses the characteristics of its mechanism to make the driving shaft and driven shaft not on the same axis. When there is an angle between the axes, it can realize the continuous rotation of the two shafts, and reliably transfer torque and motion. Compared with the common coupling, the most outstanding feature of universal coupling is that its structure has larger angular compensation ability, compact structure, and high transmission efficiency.
Universal coupling with its superior performance, the market sales are very considerable, there are many kinds of universal coupling on the market. So how to choose the right coupling? Among them, the spider type universal coupling is a kind of universal coupling with a large amount of consumption, and the bearing of this kind of universal coupling is the most easily damaged part. Generally speaking, the car will choose the ball cage universal coupling. For agricultural machinery, industrial machinery, and other sports machinery, the special universal coupling will be used, and most of the hoisting equipment will use cross shaft universal coupling.
How to Hot Install the Cross Shaft Universal Coupling?
1、 Preparation Before Hot Installation
Use gasoline or kerosene to fill and scrub the matching parts of the journal and the cross universal coupling. If there is a rough or damaged situation, it needs to be eliminated with an oilstone or fine diamond gauze, of course, other methods can also be used. Then use a micrometer to measure the internal diameter of the journal, and use a micrometer to measure the internal diameter of cross universal coupling. At least 3 points shall be measured when measuring the coupling, and repeated measurement shall be carried out. If the treatment result does not meet the requirements of the drawing, the inner hole shall be repaired with a scraper or half-round file.
2、 Hot Installation
After the preparation work, start the hot installation, which is required to be fast, so as to avoid that the temperature drops before the hot installation are completed, resulting in the reduction of the aperture of the cross shaft universal coupling and the difficulty of hot installation. Generally, the temperature of the universal coupling of the hot installed spider type will be heated to 250 ℃. Heating temperature should not be too fast, so as not to affect the temperature uniformity of the coupling, and the heating time 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 expansion value of the measured heating until the measuring stick can be put into the inner diameter hole. Then carry out the heat jacket work.
The surface of the universal joint should be carburized, quenched, or tempered. The hardness of the surface is different with different methods. Gas carburizing puts the workpiece into a closed carburizing furnace and obtains a high carbon surface layer through the gas (methane, ethane, etc.) or liquid carburizing agent (kerosene or benzene, ethanol, acetone, etc.). Solid carburizing is to put the workpiece and solid carburizing agent (composed of charcoal and accelerant) in a sealed box, heat it in the heating furnace to the carburizing temperature and keep it for a certain time so that the atoms of the universal coupling of activated carbon penetrate into the workpiece surface, which is also the earliest carburizing method.
The universal coupling with the cross shaft is a universal part of the mechanical foundation, which is suitable for two shafts with skew axis and frequent change of relative position. The biggest advantage of the cross shaft universal coupling is that it has the ability to transmit torque, angle compensation, and compact structure.
Structure Principle of Cross Shaft Universal Coupling:
The cross pieces on the driving and driven shafts are connected with the cross shafts in the middle by hinges respectively. When there is the angular displacement between the two shafts, the shaft forks rotate around their fixed axes, thus making the cross shafts move in space.
Motion Analysis of Cross Shaft Universal Coupling:
When the angle between the two shafts is not zero, the actual angle between the driving shaft angle and the driven shaft angle at any instant: the plane comes from the driving shaft 1, is the motion plane on the driving shaft fork 1, the plane is perpendicular to the driven shaft 3, and is the motion of point C on the driven shaft fork.
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