Straight travelling apparatus for heavy construction equipment
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United States of America Patent
Stats
-
Oct 28, 1997
Grant Date -
N/A
app pub date -
Jun 30, 1995
filing date -
Dec 28, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A straight travelling apparatus for heavy construction equipment, equipped with a travel supplement circuit, including a variable orifice disposed in a fluid line connected to the supply-side of the control valve of a bucket and controlled to vary an opening degree thereof by a predetermined pilot signal that is applied to the variable orifice in response to an operation of at least one of right and left travel motors in order to keep the variable orifice at a relatively closed state while being released in response to the travel motors not operating in order to keep the variable orifice in a relatively opened state, thereby capable of supplementing a sufficient amount of fluid to a travelling system when the bucket is operated during, thereby preventing an abrupt reduction in travelling speed caused by operatings the straight travelling apparatus.
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