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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > thrust sheets?? thrust bearing?? what are they?



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      02-18-2010, 02:06 PM   #1
Park828
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thrust sheets?? thrust bearing?? what are they?

What are they exactly?? it looks like from pictures that the the thrust sheets are just two thin pieces of steel rings.. do these really help?


Thrust bearings.. anyone have these?
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      02-18-2010, 02:40 PM   #2
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Thrust bearings are what allows the front strut to rotate freely when the wheels are turned one way or another. On a BMW it's integrated into the "hat" on top of the strut.
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      02-19-2010, 04:03 PM   #3
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Quote:
Originally Posted by Park828 View Post
What are they exactly?? it looks like from pictures that the the thrust sheets are just two thin pieces of steel rings.. do these really help?


Thrust bearings.. anyone have these?
Thrust sheets provide a variety of benefits to coilover systems. As a spring becomes compressed the coils attempt to distribute the energy by unwinding. This is called twisted force. The unwinding makes the spring rate irregular. By allowing the spring to smoothly rotate around the perch during compression, the spring rate will return to normal. Thrust sheets also help dampening and rebound of struts too. Thrust sheet?s bearing action allowing the rotation of a spring allow the load on the spring to be more evenly Distributed which reduces lateral shock shaft load. Increased lateral load on shock shafts cause a reduction in the struts ability to rely on valves for dampening force.
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