Hydraulic pumps build pressure by using mechanical action to force hydraulic fluid into a confined space, thus creating pressure.
Here's a more detailed explanation focusing on a piston pump example:
Piston Pumps and Pressure Generation
Piston pumps are a common type of hydraulic pump. Here's how they create pressure:
- Swashplate and Piston Arrangement: Piston pumps utilize a swashplate set at an angle. Pistons are attached to the front of this swashplate.
- Piston Movement: As the swashplate rotates, the angle causes the pistons to move back and forth (in and out) within their chambers.
- Fluid Displacement: Because the swashplate is offset at an angle, the pistons move in and out as it turns. This reciprocating motion of the pistons forces hydraulic fluid into the piston chambers and then expels it.
- Pressure Build-up: The forced movement of the fluid into a smaller volume creates pressure. The pressure increases until it overcomes the resistance in the hydraulic system (e.g., a cylinder doing work). This forces hydraulic fluid into and out of the piston chambers, therefore creating pressure within the system.
In summary, the mechanical action of pistons moving within chambers, driven by a rotating swashplate, displaces hydraulic fluid, creating pressure.
