Construction machine on which counterweight provided with muffler is mounted

Abstract

Disclosed is a construction machine in which a muffler for reducing the noise of exhaust gas emitted from the engine is mounted inside a counterweight. According to the present invention, the construction machine on which a counterweight having a muffler is mounted comprises: an upper frame pivotably mounted on a lower moving body; a driver compartment and an engine compartment mounted on the upper frame; a suction pipe communicating with the exhaust pipe of an engine mounted in the engine compartment, and into which exhaust gas flows; a muffler main body for reducing the noise of inflowing exhaust gas by means of a noise reducing device therein; a muffler comprising an exhaust pipe which emits the muffled exhaust gas to the outside; a working tool pivotably mounted on the front end of the upper frame and consisting of a boom, an arm, and a bucket which are respectively driven by a hydraulic cylinder; and a counterweight mounted on the rear end of the upper frame and having a compartment formed so as to mount the muffler therein.

What is claimed is: 
     
         1 . A construction machine on which a counterweight having a muffler is mounted, comprising:
 a lower traveling structure;   an upper frame pivotably mounted on the lower traveling structure;   an operator's cab and an engine room which are mounted on the upper frame;   a muffler including an intake pipe fluidically communicating with an exhaust pipe of an engine mounted in the engine room to allow an exhaust gas to flow into the intake pipe, a muffler body configured to reduce a noise of the exhaust gas that flows into the intake pipe through a noise reduction device provided therein, and a discharge pipe configured to discharge the noise-reduced exhaust gas to the outside;   an attachment rotatably mounted at a front end of the upper frame and including a boom, an arm, and a bucket that are respectively driven by hydraulic cylinders; and   a counterweight mounted at a rear end of the upper frame and having a space portion  18  formed therein to accommodate the muffler.