Main shaft balancing device for machine tool
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United States of America Patent
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Jul 12, 2005
Grant Date -
Apr 24, 2003
app pub date -
Sep 17, 2001
filing date -
Sep 18, 2000
priority date (Note) -
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Abstract
A gas spring comprising a cylinder body filled with compressed gas and an upright rod passing through a rod side end wall member of the cylinder body. By supporting a main shaft unit with the gas spring, the load on a vertical displacement mechanism is reduced. A pair of upper and lower ring-shaped seal members, which seal between the rod end wall member and the rod, are provided inside the rod wall member. Ring-shaped oil filling chambers are formed in between the ring-shaped seal members and between the rod end wall member and the rod. An oil filling mechanism fills the oil filling chambers with lubrication oil.
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