Lubrication system for a tool holder
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United States of America Patent
Stats
-
May 30, 1995
Grant Date -
N/A
app pub date -
Jul 6, 1994
filing date -
Jul 6, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In construction of a tool holder used for boring or tapping by vibratory rotation of a tool such as a cutter, rotation is transmitted to the tool by a rotary holder in a casing and vibration is transmitted to the tool by a vibration piece eccentrically coupled to a drive shaft. An outer oil reservoir is formed between the rotary holder and the casing whereas an inner oil reservoir is formed between the rotary holder and the vibration piece. A pump unit is arranged within the first oil conduit for communicating the two oil reservoirs so as to allow flow of oil from the inner oil reservoir to the outer oil reservoir only when the vibration piece performs a composite movement. The second oil conduit is formed in the vibration piece in order introduce oil in the outer oil reservoir into a space present at the joint of the vibration piece to the drive shaft. As the vibration piece perform the composite movement derived from rotations of the drive shaft and the rotary holder, periodical difference in pressure starts between the two oil reservoirs, which intermittently opens the pump unit in one way only. As a result, oil in the oil reservoirs is intermittently but constantly fed to the vibration piece via the oil conduits for lubrication purposes.
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