NO TAKERS...
When TGR Technical Center of Michigan
started to design a side impact
crash test system,
they were confronted
by
a linear bearing challenge - acceleration. The system
is impacted by a
hydraulic ram, accelerating to 100G's!
No linear
bearing
company would take the challenge: re-circulating
ball bushings and
rollers would freeze
or
skid because they
cannot respond to the acceleration.
Thus, they
would mechanically fail and the shaft
would be brinelled/grooved. TGR raised the bar for side impact test
systems and LM76
helped them do it. We recently finished a similar system for Jaguar
UK.
LM76 Ceramic Coated Bearings
To date, we have not had a failure (
since 1976 ) due to acceleration and speed. LM76 Ceramic Coated
Bearings are employed by Texas Instruments and
Raytheon
Space Systems on rocket sleds for testing electronic components.
System Info:
1 set of 2", fully supported diameter shafts with LM76
proprietary *ARMX Finish
6 LM76 LXPB 3248-32 Ceramic Coated Bearings - 3 each side.
Load: 2000 lbs.
Lubrication: hydraulic fluid
Drive: Hydraulic ram
* One of the
several advantages of ARMX Shafting is the formationof small pockets on the surface of the shaft. These pockets act as
smallreservoirs of lubricant.
Email from our customer:
Sorry I didn't back
to you any sooner, but we are very busy with the Side impact
trials. Breaking all kinds
of components on the system, but
the rails and pillow blocks are still holding up. The main sled was
accelerated
to over 100g's and decelerated to -20g's. The next
step will be to add the test seat and dummy on to the floating
seat plate.
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