초록 ▼

A construction machine includes an exhaust duct for discharging a lower airflow to the exterior of an engine room. An air inlet for introducing air into the exhaust duct is provided in an upper portion of the exhaust duct, and an air outlet for discharging the air from the exhaust duct is provided i

A construction machine includes an exhaust duct for discharging a lower airflow to the exterior of an engine room. An air inlet for introducing air into the exhaust duct is provided in an upper portion of the exhaust duct, and an air outlet for discharging the air from the exhaust duct is provided in a lower portion of the exhaust duct. An air passage is formed in the interior of the exhaust duct between the air inlet and the air outlet. The exhaust duct is disposed on an 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 a discharge port, and such that a hydraulic pump provided on the exhaust side of the engine room is shielded from the discharge port by the exhaust duct.

대표청구항 ▼

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 engin

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; andan exhaust duct formed of a hollow body to discharge the lower airflow to an exterior of the engine room, whereina 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, andthe 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. 2. The construction machine according to claim 1, wherein a fire wall, which partitions the engine from the hydraulic pump, is provided on the exhaust side of the engine room, and the exhaust duct is disposed below the fire wall. 3. The construction machine according to claim 2, further comprising a lower propelling body and an upper slewing body carried on the lower propelling body, wherein the upper slewing body includes an upper frame,a left-right pair of vertical plates including the vertical plate member are provided in a central portion of the upper frame in a vehicle width direction of the lower propelling body, each of the vertical plates extending in a front-rear direction,the engine room is formed in a rear portion of the upper frame,the engine is disposed in the engine room so as to extend in a left-right direction, andthe exhaust duct is disposed on a downstream side of the lower airflow relative to a specific vertical plate of the left-right pair of vertical plates, the specific vertical plate disposed on the exhaust side, while the fire wall is provided such that an air discharge port which communicates with the ventilation gap is formed between the fire wall and an upper end of the vertical plate disposed on the exhaust side. 4. The construction machine according to claim 3, wherein a lower edge of the air inlet in the exhaust duct and a lower edge of the air discharge port are disposed in substantially identical height positions. 5. The construction machine according to claim 1, wherein the air passage in the exhaust duct is formed in a bent shape including at least one bent portion. 6. The construction machine according to claim 1, wherein the exhaust duct is disposed to shield the hydraulic pump from the discharge port so that the hydraulic pump is not directly visible from the outside through the discharge port. 7. The construction machine according to claim 1, wherein the exhaust duct has an upper side portion, a lower side portion disposed below and parallel to the upper side portion via an interval, and a vertical side portion disposed perpendicularly to the upper side portion and the lower side portion so as to connect end portions on identical sides of the upper side portion and the lower side portion to each other, the exhaust duct disposed such that the hydraulic pump is sandwiched between the upper side portion and the lower side portion. 8. The construction machine according to claim 1, wherein the exhaust duct is provided on an inner side of an outer periphery of the engine room so as to extend along the outer periphery of the engine room.