The 4TNV98 - EXSDBBC engine assembly is a diesel - powered unit designed specifically for excavator applications. It is a crucial component that provides the necessary power to drive the various functions of the excavator, such as digging, lifting, and swinging.
2. Engine Configuration
Cylinder Arrangement:
The engine is a four - cylinder configuration. This layout provides a good balance between power output and smooth operation. The four - cylinder design helps in distributing the power strokes evenly, reducing vibration and ensuring a more consistent torque output during the operation of the excavator.
Bore and Stroke:
The bore (cylinder diameter) and stroke (piston travel distance) are important dimensions that determine the engine's displacement and performance characteristics. For the 4TNV98 engine, the bore is typically around 98 mm and the stroke around 110 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 39 kW (kilowatts). This power output is achieved at a rotational speed of 2200 revolutions per minute (rpm). The rated power is an important specification as it indicates the engine's ability to provide a consistent and reliable amount of work, which is suitable for driving the hydraulic pumps and other components of the excavator to perform various tasks.
Torque Output:
The torque output of the engine is related to its power and rotational speed through the formula . At 2200 rpm, the engine generates a torque that is sufficient to overcome the resistance of the load and drive the excavator's mechanisms effectively. The torque curve of the engine is designed to provide good low - speed torque for better starting and acceleration characteristics, which is essential for the excavator's operation.
Speed Range:
The engine's operating speed range usually extends from an idle speed of around 600 - 800 rpm to the maximum rated speed of 2200 rpm. The ability to operate over this range provides flexibility in 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 like swinging the excavator arm.