Deformation and Edge Lifting of Automotive Jack Support Blocks
Automotive jack support blocks are critical components that provide cushioning, vibration absorption, and load distribution between the jack and the vehicle. Deformation or edge lifting of these blocks can compromise safety, reduce lifting efficiency, and damage both the jack and the vehicle.
1. Causes of Deformation and Edge Lifting
Overloading: Exceeding the rated load of the jack or support block can lead to permanent deformation and edge curling.
Material Hardness Mismatch: Using a rubber block that is too soft or too hard for the applied load can result in uneven compression and deformation.
Aging and Environmental Exposure: Heat, UV, ozone, and chemical exposure can reduce elasticity, making the block prone to edge lifting under normal load.
Improper Installation: Misalignment or insufficient contact area can concentrate stress at the edges, causing them to lift.
Surface Damage: Cuts, abrasions, or contamination can initiate localized deformation and curling.
2. Effects on Performance
Reduced Stability: Edge lifting creates uneven contact with the vehicle, increasing the risk of slipping.
Decreased Load Distribution: Localized deformation reduces the effective cushioning and can damage vehicle chassis points.
Accelerated Wear: Deformation accelerates fatigue and cracking, shortening the service life of the block.
3. Preventive Measures
Material Selection: Choose rubber with appropriate hardness, elasticity, and chemical resistance for automotive applications.
Load Adherence: Always operate within the manufacturer’s specified load capacity.
Correct Installation: Ensure proper alignment and full surface contact between the block and the vehicle jack.
Environmental Protection: Minimize exposure to heat, UV light, ozone, and aggressive chemicals.
Regular Inspection: Check for edge lifting, deformation, or cracks and replace the block if any signs of wear are present.
4. Conclusion
Deformation and edge lifting of automotive jack support blocks are often caused by overloading, material mismatch, environmental factors, or improper installation. Selecting suitable materials, following load guidelines, and performing regular inspections are essential for maintaining safety, performance, and longevity of the jack system.
References
Gent, A. N. Engineering with Rubber: How to Design Rubber Components. Hanser Publishers, 2012.
ASTM D2000 – Standard Classification System for Rubber Products in Automotive and Industrial Applications.
ISO 7619-1 – Rubber, Vulcanized or Thermoplastic — Determination of Indentation Hardness.
Lake, G. J. “Fatigue and Fracture of Elastomers.” Rubber Chemistry and Technology, 2000.
ISO 2230 – Rubber Products—Guidelines for Storage and Maintenance.
