1. What is the Hydraulic Pump Torque Equation?

Definition: This equation calculates the torque required to drive a hydraulic pump based on system pressure and pump displacement.

Purpose: It helps hydraulic system designers and maintenance personnel determine the mechanical input requirements for hydraulic pumps.

2. How Does the Equation Work?

The equation is:

Where:

• \( T \) — Torque (lb-ft)
• \( P \) — Pressure (psi)
• \( D_p \) — Pump displacement (in³/rev)
• \( 2\pi \) — Conversion factor for rotational units

Explanation: The torque is directly proportional to both the system pressure and the pump displacement.

3. Importance of Torque Calculation

Details: Proper torque calculation ensures correct motor sizing, prevents overloading, and maintains system efficiency.

4. Using the Calculator

Tips: Enter the system pressure in psi and pump displacement in cubic inches per revolution. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What units does this equation use?
A: The equation uses US customary units (psi for pressure, in³/rev for displacement, lb-ft for torque).

Q2: Does this account for pump efficiency?
A: No, this is theoretical torque. For actual torque requirements, divide by pump mechanical efficiency.

Q3: How does displacement affect torque?
A: Larger displacement pumps require more torque at the same pressure.

Q4: Can I use this for hydraulic motors?
A: Yes, the same equation applies to hydraulic motors (output torque).

Q5: What's a typical displacement range?
A: Common pump displacements range from 0.1 in³/rev for small pumps to 10+ in³/rev for large industrial pumps.