shear pin


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shear pin

[′shir ‚pin]
(design engineering)
A pin or wire provided in a fuse design to hold parts in a fixed relationship until forces are exerted on one or more of the parts which cause shearing of the pin or wire; the shearing is usually accomplished by setback or set forward (impact) forces; the shear member may be augmented during transportation by an additional safety device.
In a propellant-actuated device, a locking member which is released by shearing.
In a power train, such as a winch, any pin, as through a gear and shaft, which is designed to fail at a predetermined force in order to protect a mechanism.

shear pin

shear pin
A specially designed pin that shears if equipment seizes or loads beyond design values are imposed. For example, shear pins are used in arrester barriers, where they give way when an aircraft engages them beyond a given momentum. They are also used in the driveshaft of some engine-driven pumps. If the pump seizes, the shear pin breaks and allows the shaft to rotate, but the pump is prevented from further damage.
References in periodicals archive ?
Shear pin or slip clutch options prevent mower damage if unseen obstacles like rocks or tree stumps are encountered
Although some constitutive models for shear pin fractures were established, however, all the parameters of the models were not established beyond doubt.
However, if the auger rusts to the drive shaft, they'll become one and the shear pin will never break.
IF THOSE LOCKS AREN'T DISENSASED BEFORE RAISINS THE E-CHU FROM ITS STOWED POSITION, A SHEAR PIN INSIDE EACH LOCK IS DESISNED TO SNAP.
Unfortunately, as I walked around the hammer operator toward the pin, my face moved through the path of the slide hammer at the precise moment the shear pin gave way.
A shear pin is designed to break if the gearing system, which engages the rope reels, has too much pressure as it works back and forth.
We can handle the metal contamination--our high-inertia rotors with shear pin protection are built to be heavy ,and solid.
The electronic shear pin senses an increase in amperage of the drive motors and turns the motors off.
In addition to helical, bevel, and worm gears, it also makes sprockets, stock-bore, taper lock and shear pin coupling, timing belt pulleys, right-angle gearboxes, and worm gear shaft-mounted and foot-mounted speed reducers.
Pertinent Data: The non-electrostatic head eliminates the interference range and features heightened damage reduction mechanisms, using both spring recovery and shear pin methods to absorb impact.
Boasting the highest flow of this valve type (the reduced port valve up to 21% better than similar designs), Weldball design improvements include a cast steel Ultra Stop Actuator and a Stop Collar that replaces the shear pin.
Post-flight inspection revealed a damaged shear pin in the left main-gear assembly and a damaged left main-landing-gear rod.