In the complex mechanical system of three-wheeled vehicles, there is a component that seems ordinary but is of vital importance — the 206 bearing 390MM of the rear axle half shaft. Although it is not large in size, it plays an irreplaceable role in the smooth driving of the vehicle and the transmission of power, and can be regarded as the unsung hero of the stable operation of the vehicle. Today, let’s delve into the mysteries of this key component together.

In-depth Analysis of the Structure: Precise Design, Achieving Excellent Performance
Inner Ring, Outer Ring and Rollers: The Core Elements for Coordinated Operation
The 206 bearing 390MM is mainly composed of an inner ring, an outer ring and rollers. The inner ring is closely sleeved on the half shaft, like a loyal guard, rotating synchronously with the half shaft. Its inner diameter is precisely designed to perfectly fit the half shaft, ensuring a firm connection during the vehicle’s driving process without the slightest looseness, providing a solid guarantee for the stable operation of the half shaft.

The outer ring is installed inside the hub of the rear axle and is relatively fixed, just like a solid fortress, providing stable support for the entire bearing. The inner ring and the outer ring cooperate with each other to jointly construct an ideal track for the smooth rolling of the rollers. These rollers are usually made of high-quality bearing steel, and the number is generally about 15 to 20. They have extremely high hardness and a surface as smooth as a mirror, which can minimize the frictional resistance. When the vehicle is driving, the rollers roll merrily between the inner ring and the outer ring, skillfully converting the rotational motion transmitted from the half shaft into a smooth rotation, effectively reducing the energy loss during the power transmission process, ensuring the efficient operation of the bearing system, and providing stable power for the vehicle’s driving.
Cage: The “Commander” for the Ordered Movement of the Rollers
In addition to the inner ring, the outer ring and the rollers, the cage is also an indispensable and important part. It is like a rigorous and responsible commander, ensuring that the rollers always maintain an even spacing during the rolling process, avoiding collisions or jams with each other. The cage is generally made by stamping thin steel plates. Its unique shape design can not only lightly wrap the rollers, giving the rollers enough space to move, but also be closely connected to the inner ring or the outer ring through a special structure and rotate synchronously with the rotation of the bearing. Under complex working conditions such as high-speed driving or frequent gear shifting of the vehicle, the importance of the cage is particularly prominent. It can enable the rollers to perform their respective duties and work in an orderly manner, effectively ensuring the stability and reliability of the bearing, preventing the bearing from being damaged due to the disorderly movement of the rollers, which in turn affects the normal driving of the vehicle, and providing a solid guarantee for the stable operation of the vehicle.
In-depth Interpretation of the Working Principle: The Key Link for Power Transmission and Balance
Power Transmission: Efficient Relay, Driving the Vehicle Forward
When the three-wheeled vehicle starts, the power of the engine is continuously transmitted to the rear axle half shaft through components such as the clutch and the gearbox. At this time, the 206 bearing 390MM becomes a key link in the power transmission. The half shaft begins to rotate under the action of the engine torque. Since the inner ring is closely connected to the half shaft, the inner ring also rotates synchronously. The rotation of the inner ring drives the rollers to roll rapidly between the inner ring and the outer ring, and the outer ring is fixed on the hub. With the rolling of the rollers, the hub also rotates smoothly. In this way, the power of the engine is accurately transmitted to the wheels through the half shaft and the 206 bearing 390MM, driving the vehicle to move forward steadily. This process is like a wonderful relay race. With its precise power transmission ability, the 206 bearing 390MM efficiently converts the power of the engine into the driving force of the vehicle, and it is the key power transmission link for the vehicle’s driving.
Support and Balance: The Stabilizer Ensuring the Smooth Driving of the Vehicle
The 206 bearing 390MM not only plays an important role in power transmission but also undertakes the heavy responsibility of supporting the wheels and maintaining the balance of the vehicle. During the vehicle’s driving process, the wheels will be subjected to various complex forces from the road surface, including the gravitational force in the vertical direction, the driving force and braking force in the horizontal direction, and the frictional force in the lateral direction. The outer ring of the 206 bearing 390MM, through its close cooperation with the hub, can effectively bear these external forces and evenly distribute them to the entire rear axle structure, avoiding damage caused by excessive local stress. At the same time, the rolling of the rollers between the inner ring and the outer ring enables the wheels to remain stable during rotation, greatly reducing the vibrations and bumps caused by the uneven road surface. It is like installing a high-performance balancer for the vehicle, allowing the vehicle to always maintain a stable posture during the driving process. Whether on a flat highway or a rough path, it can bring a comfortable and safe experience to the driver, providing a reliable guarantee for the safe driving of the vehicle.
Common Faults and Maintenance: Timely Handling to Ensure the Smooth Driving of the Vehicle
Wear and Damage: Small Problems Leading to Big Crises
During long-term use, due to the complex and changeable driving environment of the vehicle, the 206 bearing 390MM will inevitably experience wear and damage. The wear mainly stems from the continuous friction between the rollers and the inner ring and outer ring, as well as the huge pressure borne by the bearing when the vehicle is driving. As the usage time increases, when the wear reaches a certain extent, defects such as scratches and pits will appear on the surface of the rollers. These flaws are like time bombs hidden inside the bearing, which will cause abnormal noises during the operation of the bearing, and the driver can also clearly feel the vibrations when the vehicle is driving. If the severely worn bearing is continued to be used at this time, more serious problems may occur, such as the rupture of the rollers, the fracture of the inner ring or the outer ring, etc. Once these situations occur, the bearing will instantly lose its normal working ability, the vehicle may suddenly lose power, and even the wheels may fall off, seriously endangering driving safety. This is just like the joints of the human body. If they are overused for a long time and lack maintenance, after the joints are severely worn, it will not only affect movement but also may lead to more serious health problems, bringing great safety hazards to the vehicle and the driver.
Maintenance and Replacement: Timely “Treatment” to Restore the Vehicle’s Vitality
When a fault is found in the 206 bearing 390MM, immediate action should be taken for maintenance or replacement. For a slightly worn bearing, it can be repaired by means of cleaning, lubrication, etc. First, the bearing needs to be carefully removed from the vehicle. This step requires professional skills and tools to ensure that no damage is caused to other components. Then, use a special cleaning agent to carefully clean the inner ring, outer ring, rollers and cage of the bearing. The cleaning agent can penetrate into every tiny corner, removing oil stains, impurities and wear particles, restoring the bearing to cleanliness. After cleaning, apply an appropriate amount of high-quality lubricating grease to each component. The lubricating grease can effectively reduce friction and wear and extend the service life of the bearing. When reinstalling the bearing, it is necessary to ensure that the installation position is accurate and that the components are closely matched, otherwise it will affect the normal operation of the bearing.
If the bearing is severely worn or already damaged, a new bearing needs to be replaced. When selecting a new bearing, special attention should be paid to choosing a product with the same model as the original bearing and reliable quality. Bearings of different models have differences in dimensions, performance, etc. Choosing the wrong model may lead to installation failure or affect the normal operation of the vehicle. The process of replacing the bearing requires professional skills and tools, and it is recommended to be operated by professional maintenance personnel. Professional maintenance personnel have rich experience and professional technology, and they can accurately complete the disassembly and installation work to ensure that the replaced bearing works normally, providing a strong guarantee for the safe driving of the vehicle.

The 206 bearing 390MM of the rear axle half shaft of three-wheeled vehicles, although just a small component, plays a crucial role in the operation of three-wheeled vehicles. Understanding its structure, working principle, as well as common faults and maintenance methods can help us better maintain and service the vehicle, ensuring that the vehicle is always in good operating condition and providing a reliable guarantee for our travel and transportation. Let’s attach importance to this “small component” and let it continue to “escort” our three-wheeled vehicles, accompanying us to drive safely and smoothly on every journey.