By R. Keith Mobley
This ebook covers the fundamentals of fluid strength in addition to troubleshooting concepts. offers must-have info to plant and upkeep engineers and operators, and encompasses a great part on pneumatics. includes worthwhile details for upkeep and plant managers desirous to raise their very own wisdom, plan or offer education, and to operators desiring to enhance their abilities.
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Extra info for Fluid Power Dynamics
As the fluid enters the chamber on the right, it slows down and its velocity is reduced. As a volume of liquid moves from a small, confined space into a larger area, the fluid will expand to fdl the greater volume. The result of this expansion is a reduction of velocity and a momentary reduction in pressure. In the example, the force required to absorb the fluid’s inertia equals the force required to start the fluid moving originally, so that the static pressure in the right- Figure 2-6 Relation of static and dynamic factors.
The close mechanical fit and viscosity of the hydraulic fluid determine leakage rate. Cooling Circulation of the hydraulic oil through lines, heat exchangers, and the walls of the reservoir (Figure 4-2) gives up heat that is generated within the system. Without this Figure 4-2 Circulating oil cools system. Hydraulic Fluids 49 cooling, the heat generated by the hydraulic pump and mechanical work performed by system actuators would build to a point that damage of system components could cause premature failure of the system.
The drive gear in the illustration is turned by a drive shaft, which is attached to the power source. The clearances between the gear teeth as they mesh and between the teeth and the pump housing are very small. In Figure 3-2, the drive gear is turning in a counterclockwise direction and the driven gear is turning in a clockwise direction. As the teeth pass the inlet port, liquid is trapped between the teeth and the housing. This liquid is carried around the housing to the outlet port. As the teeth mesh again, the liquid between the teeth is pushed into the outlet port.