How can you change the displacement of a cam-type radial piston motor?

To change the displacement of a cam-type radial piston motor, the most effective method is to change the cam ring for one of a different size. The cam ring plays a crucial role in determining the volume of fluid that is displaced with each rotation of the motor. The design and dimensions of the cam ring directly influence the stroke length of the pistons and, thus, the overall displacement.

When a larger cam ring is used, it increases the displacement because each piston can cover a greater volume per rotation. Conversely, a smaller cam ring reduces displacement. This fundamental principle of hydraulic motor design focuses on how geometric configurations affect performance characteristics.

Other methods such as changing valves, adjusting pressure, or adding fluid do not effectively alter the displacement of the motor itself. While these factors can influence operational efficiency, flow rates, or system pressures, they do not change the actual physical displacement capacity of the cam-type radial piston motor.