Construction machine

Abstract

On an upper revolving structure, an engine having an exhaust port is mounted. In the midway portion of the exhaust pipe connecting the exhaust port of the engine and an exhaust gas post-treatment device, a first bellows pipe and a second bellows pipe are arranged through a connecting pipe having an L-shaped bending portion. In this case, the first bellows pipe and the second bellows pipe are arranged so as to have a positional relationship in which axis lines thereof (X1-X1, Z1-Z1) cross each other. That is, the first bellows pipe is arranged in a horizontal direction so that its axis line (X1-X1) extends in the left-right direction of the upper revolving structure. The second bellows pipe is arranged so that its axis line (Z1-Z1) matches the vertical direction of the upper revolving structure.

Description

TECHNICAL FIELD[0001]The present invention relates to a construction machine such as a hydraulic excavator provided with an exhaust gas post-treatment device on an exhaust pipe of an engine, for example.BACKGROUND ART[0002]In general, a hydraulic excavator which is a typical example of a construction machine is composed of an automotive lower traveling structure, an upper revolving structure rotatably mounted on the lower traveling structure, and a working mechanism liftably provided on the front side of the upper revolving structure. The upper revolving structure has a cab, a fuel tank, an operating oil tank and the like mounted on the front side of a revolving frame and has an engine for driving a hydraulic pump, a heat exchanger and the like mounted on the rear part of the revolving frame.[0003]In the hydraulic excavator in the conventional art, an exhaust pipe is connected to an exhaust port of the engine. On an outlet side of the exhaust pipe, the exhaust gas post-treatment dev...

AI Technical Summary

Benefits of technology

The present invention provides a construction machine that can improve the vibration absorbing performance of the exhaust pipe and allow for flexibility in arranging the exhaust pipe. By matching the bending deformation directions of two bellows pipes with the three axial directions of the vehicle body, vibration can be stably absorbed without making the length of the bellows pipe longer, and the elongation of the length of the exhaust pipe can be suppressed. These features enable flexibility in arrangement of the exhaust pipe, which is beneficial for construction machines that require efficient vibration absorption and arrangement flexibility.

Problems solved by technology

However, the bellows pipe has its deformable amount (contraction amount) in its length direction (axial direction) small, and vibration absorbing capacity in the length direction is not high.

Therefore, in a case where the bellows pipe is made longer, the entire length of the exhaust pipe becomes long, and there are problems that a measure to prevent sympathetic vibration is needed or limitation on freedom in arrangement leads to limitation on the vehicle body on which the exhaust pipe can be mounted and the like.

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