Selection Guide for Jack Support Blocks
Choosing the right jack support block is critical for safe, stable, and efficient vehicle lifting. Proper selection ensures load distribution, prevents equipment damage, and reduces the risk of accidents.
1. Load Capacity Considerations
Rated Load: Ensure the support block can handle the vehicle's weight with an appropriate safety margin.
Distribution of Force: Consider how the block distributes the load over its surface to prevent sinking or deformation.
Dynamic Loads: Take into account possible forces from slight vehicle movements or uneven lifting.
2. Material Selection
Rubber Blocks: Offer good friction and shock absorption but must be resistant to oil, chemicals, and environmental degradation.
Polyurethane or Plastic Blocks: Provide higher stiffness and durability, suitable for heavier loads or harsher environments.
Composite or Layered Blocks: Can combine the benefits of elasticity and rigidity, enhancing load distribution.
3. Size and Shape
Surface Area: Larger contact surfaces reduce ground pressure and improve stability.
Height: Choose blocks that match the vehicle’s lifting points without overextending the jack.
Profile: Blocks should conform to the chassis geometry to ensure full contact and reduce slipping risk.
4. Environmental and Operational Factors
Temperature Resistance: Select materials suitable for high or low-temperature environments.
Chemical Resistance: Blocks exposed to oil, fuel, or cleaning agents must resist swelling and degradation.
Ground Conditions: Consider using load-distribution plates for soft or uneven surfaces.
5. Maintenance and Inspection
Check for Wear: Inspect blocks for cracks, deformation, or surface deterioration before each use.
Replace When Necessary: Damaged or excessively worn blocks compromise stability and safety.
Storage: Keep blocks in a dry, shaded area away from sunlight, moisture, and chemicals.
6. Conclusion
Selecting the correct jack support block involves evaluating load capacity, material properties, size, shape, and environmental factors. Proper inspection, maintenance, and adherence to usage guidelines are essential for safe lifting operations and prolonged service life.
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.
Lake, G. J. “Fatigue and Fracture of Elastomers.” Rubber Chemistry and Technology, 2000.
ISO 2230 – Rubber Products—Guidelines for Storage and Maintenance.
ISO 7619-1 – Rubber, Vulcanized or Thermoplastic — Determination of Indentation Hardness.
