Constant Velocity CV Joint Lubrication | Grease Test Rig

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This article will talk about the Constant Velocity (CV) joint Grease, CV joint Lubricant working principle of automotive vehicles, and CV Joint grease test rig. We have already discussed the Pin on Disc Tester, Four-Ball Tribometers and Roll Stability Tester.

Before going forward about the CV joint grease, we must understand the CV Joints.

What is CV Joint?

Constant velocity (CV) joints can be found at the driveshaft’s ends to transfer power from the engine to the wheels. Below is a diagram of the configuration of the CV joints within the vehicle steering.

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Configuration diagram showing typical constant velocity joint.

While CV joints allow for constant velocity rotation of shafts, friction within the CV joints can create axial force and plunging force in CV joints. This causes shudder vibration and booming idle sound in the vehicle.

Grease for Constant Velocity CV Joint

Modern vehicles have been equipped with constant velocity (CV) joints. The sealed grease used for CV joints must offer low friction and wear protection for the vehicle’s lifetime. The vehicle’s vibration and noise levels are affected by grease performance. Long-distance vehicles may experience thermal and mechanical overloads. This can cause grease to lose its physical and chemical properties.

Modern vehicles have been using CV joints. They can be divided into tripod joints (TJ) and birfield joints (BJ). TJ grease generally contains mineral oil and lithium soap. TJ grease is applied to the driveshaft’s inboard joint. The structure of a TJ absorbs vibration. Antiwear additives and friction modifiers improve friction and wear resistance in TJ grease. Antioxidants and corrosion inhibitors are also added to grease to increase its resistance against oxidization or corrosion.

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BJ greases can also be made from mineral oil or lithium soap. BJ grease also requires load resistance ability because it’s applied to the outboard joint. BJ greases often contain extreme-pressure additives to improve load resistance for increased durability and load-taking capacity.

Constant Velocity CV Joint Grease Test Rig

CV joint grease test rig is usually used to determine grease life in a constant velocity joint of any automobile vehicle. CV joint grease test rig is usually used to determine grease life in a constant velocity joint of any automobile vehicle. The test rig was created, and a method was developed to determine the temperature response of various greases in a CVJ. It was built to accommodate various shaft angles, speeds, torques, and torques. It uses a unique temperature pickup system that allows the boot’s dynamic measurement of grease temperature. Below is the figure of the CV joints grease test rig, and by using this test rig, we can calculate any particular grease life at a constant velocity joints.

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CV-joint test rig

First, we need to clean the test rig and the greasing points. After properly cleaning the joints, mount CV joints to the test rig.
Need to set testing parameters to check the grease performance and monitor the results. After doing all the things properly, we need to start the test. Temperature is one of the crucial parts of the testing procedure. So, we need to monitor and document the temperature closely.

The runtime of each joint is recorded in number of revolutions. When the limit temperature is exceeded, the test is terminated.
After the test is terminated, Dismount the specimen; clean and measure wear marks.

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Grease Degradation in Constant Velocity Joints – Typical example of wear scar: (a) tripod joint grease after 45,000 km and (b) tripod joint grease after 180,000 km.

Conclusion:

This article briefly describes the CV Joints lubricants and Testing machine to calculate the life of the grease. Many improvements are going on in this modern era on the different tribometers, thus enabling the tribologists to simulate the real-time applications.
If you want to add any more suitable information about the article topic, you can mail us at industrialubricants@gmail.com

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