Which two methods are typically used to hold the vanes out against the cam ring on a vane pump?

The correct answer involves the use of centrifugal force and fluid pressure under the vanes, which are fundamental principles in the operation of vane pumps.

In a vane pump, as the rotor turns, centrifugal force pushes the vanes outward against the cam ring. This force is crucial because it ensures that the vanes make good contact with the cam ring, maintaining an effective seal and enabling the pump to generate a vacuum to draw in fluid. Additionally, fluid pressure can assist in holding the vanes in position. The pressure on the back side of the vanes helps to keep them in contact with the cam ring, which further enhances the pump's ability to maintain efficiency and performance.

These two methods effectively work together to optimize the operation of the pump, ensuring that the vanes are positioned correctly for maximum fluid displacement and minimum leakage. This cohesive interaction between centrifugal force and fluid pressure is vital for the functionality and reliability of vane pumps in various applications.