SAE J348:2020 pdf free
SAE J348:2020 pdf free.Wheel Chocks
1. Scope-This SAE standard presents the basic information required for the design and manufacture of a wheel chock.
2. References-There are no referenced publications specified herein.
3. Definitions
3.1 Wheel Chock- An external device, of, but not necessarily limited to, generally triangular configuration, which,when positioned in contact with a rubber-tired wheel at rest, will maintain the wheel at rest within the limits of the design calculations.
4. Design Calculations
4.1 Equilibrium Method- Assumptions
a.30% grade condition (based on Federal Vehicle Standard for passenger car parking brake)
b. One wheel chocked
c. Concave surface (maximum contact area) for wheel chock
d. Static load – evenly distributed
e. Maximum vertical weight acting on one wheel of 11 500 lb (5216 kg) (based on Federal Regulation of 23 000 lb (10 433 kg)
f. Maximum horizontal force parallel to incline of 23 000 Ib (10 433 kg) (based on 80 000 |b (36 287 kg) maximum gvw at 30% grade)
4.2 Energy Consideration Method- Assumptions
a.30% grade condition (based on Federal Vehicle Standard for passenger car parking brake)
b One wheel chocked
c. Plane surface for wheel chock
d. Maximum forces vary with tire size
e. Dynamic forces are considered (tire roll-back).SAE J348 pdf free download.
