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A wheel hub is a critical component of a vehicle’s wheel assembly,serving as the central mounting point for the wheel. It consists of several key components that work together to ensure the smooth and efficient operation of the wheel.
Hub Shell:
The hub shell is the outer casing of the wheel hub, typically made of sturdy and durable materials such as cast iron, aluminum alloy, or steel. It provides structural integrity and houses the internal components of the wheel hub.
Bearings:
Bearings play a crucial role in enabling the rotation of the wheel hub. They are positioned within the hub shell and support the weight of the vehicle while allowing smooth and friction-free rotation. Wheel hubs typically employ two types of bearings:
a. Ball Bearings: These bearings consist of small steel balls arranged in a circular track, reducing friction and facilitating rotational movement.
b. Roller Bearings: Roller bearings use cylindrical or tapered rollers instead of balls, offering higher load-carrying capacity and enhanced durability.
Seals:
Seals are used to protect the wheel hub’s internal components from contaminants such as dirt, water, and debris. They are usually made of rubber or synthetic materials and are positioned around the bearings to prevent the entry of harmful substances that could cause damage or premature wear.
Axle Studs or Bolts:
These are threaded metal rods protruding from the wheel hub, designed to secure the wheel to the hub assembly. The wheel is mounted onto the hub using lug nuts or bolts that are tightened onto these studs, ensuring a secure connection.
Flange:
The flange is a flat, disc-like component located at the outer edge of the hub shell. It provides a mounting surface for the brake rotor or drum, enabling the wheel hub to transfer braking force from the vehicle’s braking system to the wheel.
Wheel Studs:
Wheel studs are threaded metal rods embedded in the hub assembly, extending through the flange. Their purpose is to provide a secure attachment point for the wheel. Lug nuts or bolts are tightened onto the exposed ends of the studs to fasten the wheel onto the hub.
ABS (Anti-lock Braking System) Sensor Ring:
In modern vehicles equipped with ABS, a toothed ring is often integrated into the wheel hub assembly. This ring works in conjunction with the ABS sensor to monitor wheel speed and detect any wheel lock-up during braking, enabling the ABS system to modulate brake pressure and prevent skidding.
These components work together to ensure the proper functioning of the wheel hub, facilitating smooth rotation, supporting vehicle weight, transmitting braking forces, and maintaining the stability and safety of the vehicle. The design and composition of wheel hub components may vary depending on the vehicle type, intended application, and technological advancements in the automotive industry.
The wheel hub mainly function:
Load-bearing Function:
The wheel hub supports the weight of the vehicle and transmits it to the suspension system through the axle. It is designed to withstand the forces and stresses generated during vehicle operation, including acceleration, braking, and cornering.
Mounting the Wheel:
The wheel hub provides a secure mounting point for the wheel. The hub assembly typically consists of multiple studs or bolts extending outward from the hub. The wheel is positioned onto the hub, and lug nuts or bolts are tightened onto the exposed ends of the studs, securing the wheel in place.
Rotation and Bearings:
The wheel hub incorporates bearings that enable smooth and friction-free rotation of the wheel. These bearings, either ball bearings or roller bearings, are positioned within the hub assembly. They reduce friction and allow the wheel to rotate freely when the vehicle is in motion.
Transferring Braking Force:
The wheel hub is responsible for transferring the braking force from the vehicle’s braking system to the wheel. The brake rotor or drum is mounted on a flange attached to the hub assembly. When the brakes are applied, the calipers (in disc brakes) or shoes (in drum brakes) exert pressure on the rotor or drum, generating friction and slowing down the rotation of the wheel.
ABS Functionality:
In vehicles equipped with an Anti-lock Braking System (ABS), the wheel hub assembly may incorporate an ABS sensor ring. This toothed ring, usually integrated with the hub or mounted on the outer edge, works in conjunction with the ABS sensor. As the wheel rotates, the sensor detects the gaps or teeth on the ring, providing real-time feedback on wheel speed to the ABS system. This information allows the ABS system to modulate brake pressure to prevent wheel lock-up and maintain vehicle stability during braking.
In summary, the wheel hub in a car provides a sturdy mounting point for the wheel, facilitates smooth rotation through the use of bearings, transfers braking force, and, in ABS-equipped vehicles, enables the monitoring of wheel speed. Its proper functioning is crucial for overall vehicle performance, stability, and safety.
Auto Rear Wheel Hub Bearing 42450-52040 For TOYOTA YARIS
PRODUCT NAME: Auto Rear Wheel hub bearing 42450-52040 for TOYOTA YARIS
ENGINE: 1NR-FE, 1KR-FE
VEHICLE:
DAIHATSU CHARADE 1.33 16V
TOYOTA YARIS (SCP9_, NSP9_, KSP9_, NCP9_, ZSP9_) 1.33 VVT-i, YARIS (SCP9_, NSP9_, KSP9_, NCP9_, ZSP9_) 1.0 VVT-i, YARIS (SCP9_, NSP9_, KSP9_, NCP9_, ZSP9_) 1.4 D-4D, YARIS (SCP9_, NSP9_, KSP9_, NCP9_, ZSP9_) 1.3 VVT-i, ARIS (SCP9_, NSP9_, KSP9_, NCP9_, ZSP9_) …
