The Cumins 4B3.9 - G1 (24kW) generator set engine delivers a stable 24kW rated power (approximately 32hp) at a rated speed of 1500RPM, with a standby power output of up to 27kW (36hp). This power level precisely meets the power needs of small commercial spaces, small industrial equipment, and emergency backup power. Whether it's powering daily lighting and cash register systems in convenience stores, operating some equipment in small processing plants, or maintaining basic electrical appliances in homes during sudden power outages, this engine can easily handle the task, ensuring a stable and continuous power supply and meeting the diverse needs of various small power applications.
The Cumins 4B3.9 - G1 (24kW) generator set engine features a 4-cylinder inline design with a 102×120mm bore and stroke combination, resulting in a displacement of 3.9L. Powerful torque is delivered even at low rpm, reaching 153 Nm at rated power and increasing to 172 Nm at standby power. The 4B3.9-G1 engine achieves precise fuel-air mixing and efficient combustion through optimized combustion chamber structure and fuel injection system. Its high compression ratio of 16.5:1 allows the fuel to fully release its energy within the combustion chamber, converting more chemical energy into mechanical energy.
The Cumins 4B3.9-G1 (24 kW) engine is equipped with a BYC A pump fuel system, which features high-precision fuel injection control. This system precisely adjusts the injection quantity and timing based on varying engine operating conditions, ensuring complete combustion under all operating conditions and minimizing fuel waste and pollutant emissions caused by incomplete combustion. Furthermore, the system's exceptional stability and reliability significantly reduce the risk of downtime due to fuel system failure, ensuring continuous, stable engine operation.
The effectiveness of hydraulic-mechanical transmission is often reflected in the functionality of cranes. For example, it supports and stabilizes the vehicle body. This is achieved through rational oil inlet and return lines, which cause the front and rear leg hydraulic cylinders to extend their pistons to support the vehicle body. Extending the pistons of the hydraulic cylinders in the stabilizer position rigidly connects the rear axle to the vehicle body, providing stability. In boom extension and luffing, the hydraulic-mechanical transmission system primarily facilitates any combination of telescopic, luffing, lifting, and slewing movements, thereby improving work efficiency. However, to prevent the boom from freely dropping due to gravity loads, counterbalance valves are added to the extension and luffing circuits, respectively, to provide one-way locking of the hydraulic cylinders, ensuring reliable support for the boom. The realization of lifting and lowering actions is also inseparable from the hydraulic mechanical transmission system. For example, for lifting loads, the reversing valve can be manipulated to cause the pump oil to enter the brake hydraulic cylinder, and then enter the lifting motor mechanism through the reversing valve and the balance valve. At this time, the lifting motor will rotate the drum under the action of the mechanical transmission power to complete the lifting of the load, and when lowering the load, it will cause the lifting motor to rotate in the opposite direction. At the same time, combined with the return oil circuit, the load falls steadily. Finally, the rotary worktable is driven by the hydraulic motor to realize the rotation of the load. At the same time, in order to protect the hydraulic components from damage, an oil filter is added to the oil discharge circuit in the hydraulic pump. When adjusting the speed of the working mechanism, it is often necessary to change the engine speed and manually adjust the reversing valve to realize the role of the hydraulic mechanical transmission system in the rotation of the crane load.
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