Patent ID: 9091038
Filing Date: 2015-07-28
Classification: B60K,B60Y,B62D,E02F,F01P

Abstract:
1. A construction machine, comprising: an engine room; a floor constituting a bottom surface of the engine room; an engine provided in the engine room such that a ventilation gap is formed below the engine; a hydraulic pump provided in the engine room on an exhaust side serving as one side of the engine; a fan which is provided in the engine room on an intake side serving as an opposite side of the engine to the hydraulic pump, and which, when the fan is rotated, generates a cooling airflow that includes a lower airflow passing through the ventilation gap and flows from the intake side to the exhaust side; a vertical plate member standing up on the floor, the vertical plate member having an upper plate end located just below the hydraulic pump, the upper plate end allowing the airflow having passed through the ventilation gap to pass over the upper plate end to the exhaust side; and an exhaust duct formed of a hollow body to discharge the lower airflow to an exterior of the engine room, wherein a discharge port is provided in a part of the floor on the exhaust side of the vertical plate member, the exhaust duct has a duct wall standing up on the floor around the discharge port and surrounding an air passage extending vertically above the discharge port, the air passage opened upward to form an air inlet and opened downward to form an air outlet, the duct wall having an upper portion and a lower end, the upper portion surrounding the air inlet at a position higher than the upper surface of the floor to allow the airflow having passed over the upper plate end to be introduced into the air passage through the air inlet at the position higher than the upper surface of the floor, the position allowing the duct wall under the air inlet to be interposed between the hydraulic pump and the discharge port so as to shield the discharge port from the hydraulic pump, the lower end forming the air outlet for discharging the air from the exhaust duct, and the air passage is formed in an interior of the exhaust duct between the air inlet and the air outlet, and the lower end of the duct wall is mounted on the floor to surround the discharge port and disposed on the exhaust side of the engine room such that the air introduced into the air passage in the exhaust duct through the air inlet is discharged below the engine room from the air outlet through the discharge port and the hydraulic pump is shielded from the discharge port by the exhaust duct.