The common types of rubber bushings mainly include four types: pure rubber bushings, hydraulic bushings, polyurethane (PU) bushings, and spherical bushings. They differ in structure, performance, and application scenarios.
1. Pure Rubber Bushings (Most Mainstream)
Structure: Composed of a metal inner sleeve, a rubber layer, and an outer sleeve, vulcanized together. It relies on the elasticity of the rubber to absorb vibrations.
Features: Balanced damping effect, moderate cost, maintenance-free, widely used in control arms, stabilizer bars, subframes, etc., of passenger cars.
Advantages: Good NVH performance, improving ride comfort.
2. Hydraulic Bushings (Commonly Used in High-End Models)
Structure: A cavity is designed inside the rubber and hydraulic oil is injected to form a damping system.
Features: Softly filters vibrations at low frequencies and stiffens to provide support at high frequencies, achieving a balance between comfort and handling.
Applications: Commonly found in engine mounts or rear control arms of luxury cars such as the BMW 7 Series and Mercedes-Benz S-Class. Advantages: Significantly improves driving quality and suppresses resonance.
3. Polyurethane (PU) Bushings (For Modified/Performance Cars)
Material: Uses high-hardness polyurethane instead of traditional rubber.
Features: Almost no deformation, clear road feel, and extremely fast steering response.
Applications: Commonly used in track-modified cars or vehicles seeking ultimate handling.
Advantages: Significantly improves chassis rigidity and stabilizes four-wheel alignment.
