semi trailer upper coupler and king pin strength
semi trailer upper coupler and king pin strength
(OP)
SAE J 133 is unclear about load "C" in the only indication that it is fully reversing is the double arrow in fig 2. I assume that a fully reversed load being more severe is the correct load case.
Are canadian stds. similar?
Is the research being done at Penn State/Army/USDOT on king pin loads going to force a change in the SAE standard?
Are canadian stds. similar?
Is the research being done at Penn State/Army/USDOT on king pin loads going to force a change in the SAE standard?





RE: semi trailer upper coupler and king pin strength
RE: semi trailer upper coupler and king pin strength
They often do, but they probably shouldn't.
ISO standards (337 and 4086) allow for two sizes of kingpin - 2" for ordinary jobs and 3.5" for heavy haulage.
I'm quite surprised at how many big trailers come with small pins.
A.
RE: semi trailer upper coupler and king pin strength
BTW, I have seen upper couplers designed to provide for interchanging 2" and 3.5" pins, but have never seen anyone do it.
rmw
RE: semi trailer upper coupler and king pin strength
I agree that the kingpin probably isn't the weak point.
For everyday loading, I see what you mean about the drive shaft.
In an accident case, I believe it's not unknown for the bolts that hold the fifth wheel onto the rails on the tractor to be the weak link.
A.