Aqueous Urea Tank Structure for Construction Machine

Abstract

An aqueous urea tank structure is provided for a construction machine, in which a temperature rise of the aqueous urea within the tank can be suppressed and the load applied to the tank due to vibration of a vehicle body can be reduced. The aqueous urea tank structure including an aqueous urea tank which is disposed within a revolving upperstructure of a hydraulic excavator to store aqueous urea that purifies the exhaust gas discharged from an engine, wherein the aqueous urea tank structure further includes a securing member which encloses the periphery of the aqueous urea tank to secure the aqueous urea tank within the revolving upperstructure, and heat insulating materials which are interposed between the securing member and the aqueous urea tank to hold the aqueous urea tank. The securing member contains a box.

1 . An aqueous urea tank structure for a construction machine, the aqueous urea tank structure being provided in the construction machine which has a revolving upperstructure, an engine disposed within the revolving upperstructure, and a hydraulic pump driven by drive force of the engine, the aqueous urea tank structure comprising:
 an aqueous urea tank which is disposed within the revolving upperstructure to store aqueous urea that purifies exhaust gas discharged from the engine;   a securing member which encloses the periphery of the aqueous urea tank to secure the aqueous urea tank within the revolving upperstructure;   heat insulating materials which are interposed between the securing member and the aqueous urea tank to hold the aqueous urea tank; and   a mounting portion, to which a bolt for fixing the securing member within the revolving upperstructure is attached, in a lower portion of the securing member.   
     
     
         2 . An aqueous urea tank structure for a construction machine according to  claim 1 , wherein:
 the securing member contains a box.   
     
     
         3 . An aqueous urea tank structure for a construction machine according to  claim 1 , wherein:
 the securing member contains a frame.   
     
     
         4 . An aqueous urea tank structure for a construction machine according to  claim 1 , wherein:
 the heat insulating materials are disposed in some parts of a space between the securing member and the aqueous urea tank.   
     
     
         5 . An aqueous urea tank structure for a construction machine according to  claim 4 , wherein:
 one of the heat insulating materials which is provided in a bottom portion of the aqueous urea tank is made of a rubber material.