The 4HK1 - XDHAG - 01 - C3 engine assembly is a four - cylinder diesel engine designed specifically for use in excavators such as the ZX240 - 3 and ZX250 - 3 models. It is a crucial component that provides the necessary power for the heavy - duty operations of these excavators.
2. Engine Configuration
Cylinder Arrangement:
The engine features a four - cylinder in - line configuration. This layout provides a good balance between power output and smooth operation. The in - line arrangement simplifies the engine's structure and allows for efficient transfer of power from the pistons to the crankshaft.
Bore and Stroke:
The bore (cylinder diameter) and stroke (piston travel distance) are important parameters that determine the engine's displacement and performance. For the 4HK1 engine, the bore might be around 118 - 120 mm and the stroke around 130 - 132 mm. These dimensions result in an effective displacement that is optimized for the power requirements of the excavator.
3. Power and Performance
Rated Power:
The engine is rated at 140 kW (kilowatts). This power output enables the excavator to perform a wide range of tasks such as digging, lifting, and loading with sufficient force. The rated power is achieved at a rotational speed of 2000 revolutions per minute (rpm), which indicates the speed at which the engine operates most efficiently for the intended applications.
Torque Output:
The torque output of the engine is a crucial factor for its performance. The relationship between power, torque, and rotational speed is given by the formula (with appropriate units conversion). At 2000 rpm, the engine generates a significant amount of torque to drive the hydraulic pumps and other mechanical components of the excavator. The torque curve is designed to provide high - torque output at low - to - medium speeds, which is essential for the heavy - load operations of the excavator.
Speed Range:
The operating speed range of the engine typically extends from an idle speed of around 600 - 800 rpm to the maximum rated speed of 2000 rpm. The ability to operate over this range allows the engine to adjust its power output according to the specific requirements of different excavator operations. For example, at lower speeds, it can provide the necessary torque for slow - moving digging operations, while at higher speeds, it can power the hydraulic systems for faster movements.