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How does universal joint work?
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How does universal joint work?

Views:0     Author:Site Editor     Publish Time: 2021-03-12      Origin:Site

As universal joint is the heart of the machine, it is necessary for us to know the working principal of universal joint. Invention of universal joints dates back many centuries. Even though the universal joint’s mechanism seems simple, the physics behind this mechanism are rather complicated and interesting. We will understand the working of universal joints in a simple yet logical manner.


  • How does universal joint work?

  • How can we use universal joint safely?

  • How to maintain universal joint?


How does universal joint work?

In order to satisfy transmitting power and adapting to the angle change caused by the up and down jumps generated by the steering and the running of the car, the drive axle of the front drive car, the half shaft and the wheel axle are commonly connected by universal joints. However, due to the limitation of the axial size, the required deflection angle is relatively large. A single universal joint cannot make the instantaneous angular velocities of the output shaft and the shaft input shaft equal, which will easily cause vibration, aggravate component damage, and generate a lot of noise. Therefore, various constant velocity universal joints are widely used.

In front-drive vehicles, each half shaft uses two constant velocity universal joints. The universal joint near the transaxle is the inner universal joint of the half shaft, and the outer universal joint of the half shaft is near the axle. In a rear-drive car, the engine, clutch, and transmission are installed on the frame as a whole, and the drive axle is connected to the frame through an elastic suspension. There is a distance between the two and needs to be connected. During the operation of the car, the bouncing by uneven road surface, load changes, or the position difference between the two assembly installations will cause the angle and distance between the transmission output shaft and the input shaft of the drive axle final reducer to change. Double universal joints are adopted, that is, there is a universal joint at each end of the transmission shaft. Its function is to make the angle between the two ends of the transmission shaft equal, so as to ensure that the instantaneous angular velocity of the output shaft and the input shaft are always equal.


How can we use universal joint safely?

According to the inspection of most damaged universal joint, most of them are burnt due to lack of oil, dry friction and heavy load.

In order to avoid premature gimbal assembly wear damage, first of all during installation, make sure that the openings of the two clamp forks are in the same plane. Be careful not to install the wrong direction. In this way, the vibration of the farm tool can be avoided, as well as the noise of the universal joint assembly and damage to the mechanical parts.

Secondly, adjust the length of the upper tie rod of the three-point suspension to make the universal joint assembly work in a parallel and straight state as much as possible. The maximum inclination angle at both ends of the universal joint should not exceed 10 degrees when working, and the smaller the inclination angle, the better it is. It should be clearly pointed out here that universal joints are not universal.

When the universal joint is raised in the working state, slow down the rotation speed and limit the hydraulic lifting and lifting height so that the maximum inclination angle at both ends of the universal joint does not exceed 30 degrees. During operation, that is, when the rotary tiller and other agricultural tools are turning, they should not be raised too high.

In addition, the unit must first engage the power output shaft when starting, and then put on the working gear, then gently release the clutch, and at the same time manipulate the oil pressure to make the working parts of the rotary tiller and other agricultural tools gradually crowded, and then increase the throttle until it is normal operation.


How to maintain universal joint?

Universal joint is a transmission output shaft and final drive input shaft in different straight lines. Even if the angle and distance between the two shafts change, power can be transmitted.

In the maintenance of the universal joint, it is very important to ensure the lubrication of the universal joint that the amount of oil injection must be reasonable within the possible range. The fueling hole is blocked, the grease nipple is smashed into the hexagonal deformation or the grease nipple is rusted, the oil circuit will be blocked so that the grease nipple should be replaced in time. During the replacement process, keep the area around the interface clean. It is necessary to prevent the mixing of impurities, dust and sand in the machine.

The intake pressure of the grease gun is insufficient. The high-pressure oil injector is an oil injection device powered by compressed air. The function of pump is to produce high pressure by oil, and then the high pressure is used for oil injection. Pay attention to starting the air compressor before using, and prepare compressed air of about 0.6 MPa. The working principle of refilling grease which is not suitable for lubricating grease is that the thickening agent keeps the oil in the position where needs lubrication. When there is a load, the thickening agent can release the oil to play a lubricating effect.

The universal joint is a special coupling. Due to its structural characteristics, the driving shaft and the driven shaft are not on the same axis. When there is an angle between the axes, the connected two shafts can rotate continuously, and reliably transmit torque and movement.


Learn more something about universal joints can know the working principal of universal joints and how to maintain universal joints. If you want to buy good shaft couplings with reasonable price, FOSHAN HOUZHE TRANSMISSION EQUIPMENT CO., LTD. is your best choice. Whether from quality or price, or delivery time, we can help customers to open up a further and larger market. We have all types of different universal joint, as well as shaft couplings. And if you have any questions, you can contact us or search us online.




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