What is Push Out Force?
The push out force of a roller chain is the force required to push the
pin from the outer plate or the bush from the inner plate.
Therefore, it is also called “pushing force” or “pressing force”.
The push out force of the chain is also one of the important factors that
must be considered in the design of the chain.
If the push out force is insufficient, the chain may become loose during
use and may even break.
Therefore, when designing a chain, the push out force needs to be taken
into account to ensure that the chain can carry the required load.
How much push out force the chain needs depends on many factors, such as
the use of the chain, its size and materials…etc.
In general, chains with big size or heavier load require higher push out
forces.
The push out force is similar in nature to the tensile strength, only the
minimum value needs to be set.
At present, the international standards to roller chains only stipulate
the minimum value of the tensile strength, but there is no clear
regulation on the push out force.
The only international standard that stipulates push out force is API
SPECIFICATION 7F Oilfield Chain Standard.
MCC’s Push Out Force testing machine
The machine used by our company to test the push out force is the same
as the tensile strength testing machine.
Put the object to be tested on the machine table, and then apply force on
the pin/bush to test the force required to push the pin/bush out of the
chain.
