Abstract:
An injector injects urea water as a liquid reducing agent; a NOx sensor detects concentration of nitrogen oxide in exhaust gas; and an air duct including an inlet side opening and outlet side opening cools at least either one of urea water in urea water hose, NOx sensor or injector with cooling air introduced from outside of the machine room. A ventilation opening at the outside of the machine room communicates with the inlet side opening of the air duct using negative pressure formed in a circumference of exhaust gas flow by an ejector arranged in an exhaust pipe passage.
Abstract:
Provided is an apparatus which is capable of excellently mixing exhaust gas discharged from an engine with exhaust air to thereby improve lowering of temperature of the exhaust gas and suppression of noise. The apparatus comprises: a duct provided beneath an engine and having an upper edge surrounding an exhaust air inlet; an exhaust-gas pipe having an intra-duct portion extend inside the duct in a direction approximately perpendicular to a flow direction of the exhaust air; and an exhaust-gas-pipe cover provided just above the intra-duct portion to protect the intra-duct portion from oil which can drop down from above.
Abstract:
A hydraulic system is disclosed for use with a machine. The hydraulic system may have a pump configured to pressurize fluid, a first actuator configured to receive pressurized fluid from the pump, and an accumulator configured to receive fluid from the first actuator. The hydraulic system may also have a second actuator configured to receive pressurized fluid from the pump and the accumulator, and a pilot circuit configured to receive pressurized fluid from the pump and the accumulator. The hydraulic system may further have at least one valve movable to provide priority of fluid flow from the accumulator to the pilot circuit over the second actuator when a pressure of the accumulator is less than a low-pressure threshold.
Abstract:
Provided is a construction machine including an upper slewing body slewably mounted on a lower travelling body and an electric component attached to the upper slewing body. The upper slewing body includes an operator seat, a seat stand including a top plate portion having an upper surface on which the operator seat is placed, an engine disposed below the top plate portion, a heat exchanger disposed, with a space between the heat exchanger and the seat stand, on one outer side of the seat stand in a width direction; and a partition member disposed in the space to vertically partition the space so as to block upward transmission of heat of the engine. The electric component is disposed above the partition member and on the one outer side of the seat stand inside the upper slewing body.
Abstract:
Two sets of assemblies are arranged such that a diesel particulate filter device of an assembly as a first set, a selective catalytic reduction device of the assembly as the first set, a selective catalytic reduction device of an assembly as a second set, and a diesel particulate filter device of the assembly as the second set are located next to each other in this order. Respective first and second connection pipes are routed through a region directly underneath an arrangement region where the two selective catalytic reduction devices and the like are arranged, and connected to the respective diesel particulate filter devices. Thereby, an engine unit and a work vehicle which facilitate connection between an engine and an exhaust gas treatment structure and can reduce a load on the first and second connection pipes due to vibration can be achieved.
Abstract:
The present invention intends to provide a working machine capable of improving the heat exchange efficiency of the radiator and of suppressing degradation of performance of the radiator even when the oil cooler is clogged up, in the working machine arranging the radiator and the oil cooler above the engine. A working machine includes: a motor; a fan arranged above the motor, the fan being configured to generate an air flow downward; a radiator arranged above the fan; and an oil cooler arranged adjacent to the radiator. In addition, the working machine includes: a shroud disposed around fan, the shroud including: a rim portion forming an air vent hole, the air vent hole being for passage of the air flow generated by the fan; and a support member attached to an upper portion of the shroud, the support member being configured to support the radiator and the oil cooler.
Abstract:
A fan assembly for a work vehicle includes a fan shroud defining an opening and a fan. The fan includes a rotor and one or more blades extending outwardly along a radial direction from the rotor. The fan assembly additionally includes a wear ring attached to the fan shroud and extending inwardly along the radial direction. The wear ring is configured to interact with tips of the blades to increase an efficiency of the fan assembly.
Abstract:
A wheel loader is provided with a cab, a ladder, a vehicle body cover, an engine, an air cleaner, and an expansion member. The ladder has first to third steps. The air cleaner is disposed to the outside of the vehicle body cover and above and to the rear of the ladder. The expansion member is able to assume an expanded posture and a retracted posture. The expansion member abuts at least one step in the expanded posture.
Abstract:
A work vehicle includes an engine, an injector injecting a reducing agent to an exhaust gas exhausted from the engine, a determination portion determining whether or not a temperature of the injector is high, a stop determination portion determining whether or not the engine has stopped while the injector is in a high-temperature state as a result of determination by the determination portion, a counter counting the number of times of stop of the engine while the injector is in the high-temperature state based on a result of determination by the stop determination portion, and a warning portion giving a warning in connection with stop of the engine when a count value of the counter exceeds a first prescribed value.
Abstract:
A supporting mechanism supports first and second exhaust treatment devices for treating exhaust gas from an engine, and includes a sub-bracket, a base bracket, and first and second supporting members. The base bracket includes first and second connecting parts, and first and second pipe members. The sub-bracket supports the first and second exhaust treatment devices. The base bracket supports the sub-bracket. The first and second supporting members respectively support one side and the other side of the base bracket. The first and second connecting parts are respectively joined to the first and second supporting members. The first and second pipe members are installed between the first and second connecting parts. The sub-bracket is attached to the first and second pipe members, extends in the lateral direction of the first and second pipe members, and is separated from the first and second connecting parts.