The ball joint is an important component of the connecting part of the car steering rod, also known as the ball head, ball joint, ball joint, etc. The following is a detailed introduction to ball sales:

1¡¢ Functions and Applications

Function: Used for articulated steering mechanisms, such as articulated steering mechanisms and suspensions in automobiles.

Application: Control arm connected to steering knuckle, steering gear connected to steering knuckle, double wishbone suspension, upper and lower arms connected to steering knuckle with 3 ball pins, stabilizer bar connected to shock absorber, stabilizer bar connected to stabilizer bar link, rear axle stabilizer bar and stabilizer bar link also connected with ball pins, and back door support rod also connected with ball pins.

2¡¢ Structure and Composition

Structural types: There are mainly two types of structures, one is the combination of ball pins and integral ball seats, and the other is the combination of hemispherical ball pins and spheres.

Components: The ball pin assembly generally includes parts such as the ball pin, ball seat, ball bowl, stopper cover, and sealing cover.

Material and treatment:

End cap: Steel stamping parts are commonly used, with carbon steel as the main material, and aluminum alloy or ductile iron are also used.

Ball pin: The surface processing accuracy is high, and alloy steel with good hardenability is often used. The surface of the ball pin that matches with the metal ball needs to undergo surface hardening treatment such as high-frequency quenching to improve wear resistance. Nowadays, ball pins and non-metallic ball seats are commonly used, so only the ball pins need to be quenched and tempered.

Ball seat: Made of surface hardened steel, powder metallurgy, nylon, polyacetal resin, polyurethane, and polyester elastomers. Due to the significant impact of the material and shape of the ball seat on wear and fatigue life, molybdenum disulfide or oil can be immersed in the material to improve wear resistance. Strengthening ribs can also be added to the ball seat or composite materials can be used.

Dust cover: The material is mostly polyurethane or chloroprene rubber, which is resistant to high temperature, oil, and aging. When designing, deformation during movement should be considered to prevent dust from entering the ball joint bolt from the mating surface after deformation. At the same time, the precision of the fit between the dust cover and related components also has a significant impact on the sealing performance and service life.

3¡¢ Technical requirements

Performance requirements: The ball pin assembly is connected to the control arm and steering knuckle, and needs to transmit force and torque to ensure the normal operation of the vehicle. Therefore, it is required that each connecting part must be a rigid connection to ensure strength and stiffness requirements. At the same time, all components must not experience slippage, deformation, or damage.

Design optimization: By using finite element calculation and other methods, different types of ball joint pin designs can be compared and optimized based on the evaluation principle of stress equalization. For example, the design of "variable cross-section" may have better stress distribution.

Safety considerations: As a safety component of automobiles, if the ball pin breaks or falls off during driving, it will directly cause safety issues such as steering failure or axle breakage of the vehicle. Therefore, its design and manufacturing process must strictly comply with relevant standards and specifications.

4. Price

The price of ball sales varies depending on factors such as model, material, and craftsmanship. Generally speaking, the price of ball sales for ordinary cars ranges from tens to hundreds of yuan. The specific price needs to be further inquired and negotiated based on factors such as purchase quantity and supplier.