Dieselhydraulische

Dieselhydraulische refers to drive systems that use a diesel engine to power hydraulic equipment in order to transmit mechanical power. In such systems, a diesel engine drives a hydraulic pump that pressurizes hydraulic fluid. The pressurized fluid is directed to hydraulic motors or actuators, which convert the fluid power back into rotational or linear motion to drive wheels, propellers, or other machinery. The arrangement can provide a continuous, controllable transmission with high starting torque and compact packaging.

Principle and components: The core is a diesel engine connected to a hydraulic pump. The pump delivers high-pressure fluid through hoses and valves to hydraulic motors and actuators. Control valves regulate flow and pressure to vary speed and torque. A reservoir, cooler, filtration, and a pressure relief system manage fluid quality and temperature. Some installations use accumulators to store energy and smooth power delivery. The system may be integrated with a gearbox or be used as a direct hydraulic drive.

Applications: Dieselhydraulic drives have been employed in heavy construction equipment, mining machinery, and certain forestry machines, where high torque at low speeds and smooth, continuous control are advantageous. They have also appeared in some niche maritime propulsion or special-purpose vehicles. In modern practice, many applications have shifted toward diesel-electric or mechanical systems, but dieselhydraulic drives remain in use where their particular traits suit the task.

Advantages and challenges: Benefits include high starting torque, smoothness, and the ability to decouple engine speed from output speed. Disadvantages involve system complexity, potential hydraulic leaks, heat generation, and maintenance requirements. Efficiency can be lower than direct mechanical transmissions, and reliable hydraulic fluid management is essential for performance and longevity.