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Performance Requirements for Parking Stability of Motorcycles (SAE J1248:2022)
SAE J1248:2022 specifies performance requirements for the parking stability of two-wheeled motorcycles intended for highway use. This standard ensures that motorcycle side and center stands provide safe and reliable parking under specified conditions. Compliance is determined by testing according to SAE J1101 under the curb weight condition.
Key Requirements
| Requirement | Side Stand | Center Stand |
|---|---|---|
| Maximum Pressure on Parking Surface | 700 kPa (100 lbf/in²) | 700 kPa (100 lbf/in²) |
| Minimum Required Tip Over Angle | As specified in SAE J1101 | |
| Minimum Required Roll Off Angle | As specified in SAE J1101 | |
Both stand types must meet the same pressure limit. The tip over and roll off angle requirements are defined in the referenced test procedure and must be satisfied to ensure that the motorcycle remains stable in parking positions.
Engineering Design Insights 🛠️
Design engineers should consider the following when designing parking stands:
- Ground Pressure: The stand foot effective area must be large enough to keep the ground pressure at or below 700 kPa. This influences foot geometry and material selection.
- Stability Angles: Stands must provide sufficient lean angle to meet the tip over and roll off requirements. This involves proper placement of stand pivot points and foot contact geometry.
- Durability: Material wear and deformation over time can increase contact pressure or reduce stability. Consider using hardened materials or replaceable feet.
- Attachment Points: Reinforce stand mounting points to withstand repeated loading without failure.
- Testing Compliance: Integrate the SAE J1101 test procedure early in the design cycle to verify performance and avoid late-stage redesign.
⚠️ Common Mistake: Assuming side and center stands have different pressure limits. Both are required to meet 700 kPa. Also, ensure you are using the latest version of SAE J1101 for testing.
Frequently Asked Questions
What is the difference between tip over angle and roll off angle?
The tip over angle refers to the angle at which the motorcycle will tip over when parked on its stand, typically measured from vertical. The roll off angle is the angle at which the motorcycle will roll off the stand when parked on a slope. Both are defined in SAE J1101.
Are electric motorcycles covered by this standard?
Yes, as long as they are two-wheeled motorcycles intended for highway use. The standard applies regardless of propulsion type—internal combustion engine or electric motor.
How is the effective area of the stand foot calculated for pressure verification?
The effective area is the contact area of the stand foot on the parking surface when the motorcycle is in its normal parking attitude under curb weight. It is measured as part of the test per SAE J1101. The pressure is then calculated as the vertical load divided by the effective area.
What is the curb weight condition referenced in the test?
The curb weight condition typically means the motorcycle prepared for normal operation (full fuel, engine coolant, engine oil, and with standard equipment) but without rider or cargo. This condition is specified in SAE J1101 for testing.
🔍 Design Tip: For concrete parking surfaces, a pressure limit of 700 kPa is common. However, consider softer surfaces like asphalt or gravel where surface indentation might occur. While the standard specifies only the pressure limit, designing for lower pressure can improve versatility.
Adhering to SAE J1248:2022 ensures that motorcycle parking stands are safe and reliable for everyday use. Engineers should consult the full standard and its referenced test procedure SAE J1101 for complete details.
