Which components are used for energy transport between different machine units of a system?

The correct choice highlights components specifically designed for mechanical energy transport between machine units. Timing belts and power screws play essential roles in converting rotational motion into linear motion and transmitting force.

Timing belts are often utilized in synchronous drive systems where precise timing and synchronization of movement are crucial, as seen in machinery like conveyor systems or automotive applications. This allows different parts of a machine to work together harmoniously, facilitating efficient operation.

Power screws, on the other hand, are used to convert rotational energy into linear motion, typically in applications like jacks, clamps, or presses. They allow for the transfer of force and energy over a distance, making them vital in machinery that requires controlled movement.

In contrast, other options include components that either do not serve the specific function of energy transport or do so in a less direct way. For instance, hydraulic fluid and bearings are primarily involved in lubrication and support rather than direct energy transmission. Pulleys and chains facilitate energy transfer but are specifically mechanical forms of energy transport typically focused on translating movement over a distance rather than transporting energy itself in varied forms like that of timing belts and screws. Wires and connectors are centered around electrical energy transport rather than mechanical systems. Thus, the focus on mechanical energy transfer in the chosen answer aligns