Truck frame for construction machine
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United States of America Patent
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Aug 13, 2013
Grant Date -
Sep 1, 2011
app pub date -
Feb 24, 2010
filing date -
Mar 4, 2009
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A frame for use in a construction machine such as a hydraulic excavator, in which a circle member (18) for mounting a swing circle to a center frame is secured. An outer curved portion (21A) with a recessed groove shape is provided over the entire circumference in a vertically intermediate portion of the outer peripheral surface of the circle member, and an inner curved portion (21B) with a recessed groove shape is provided over the entire circumference in a vertically intermediate portion of the inner peripheral surface of the circle member to thereby make it possible to render small the plate thickness (t) of the hourglass-shaped thin-walled portion (21) located in the vertically intermediate portion relative to the plate thickness (T) of upper and lower thick-walled portions (19, 20) located on both vertical end sides of the circle member. Consequently, the weight of the circle member can be reduced.
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