LUBRICATION RETENTION APPARATUS FOR POWER TOOL
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United States of America Patent
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Issued Date -
Aug 21, 2008
app pub date -
Feb 15, 2007
filing date -
Feb 15, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A gearbox is provided for a handheld power tool. The gearbox includes a housing including a recess having a wall section, a main gear disposed within the recess and including a plurality of gear teeth, and a drive gear engaged with the main gear for driving the main gear. The gearbox also includes means for retaining lubricant within the housing for improved retention of the lubricant on the main gear. The means for retaining is configured to create a localized pressure reduction within the housing during operation of the power tool. In one example, a portion of the wall section curves towards the main gear, and a localized pressure reduction is formed proximate the minimum distance between the curving wall section and the main gear during operation of the power tool.
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