1. What is Hydraulic Pump Torque?

Hydraulic pump torque is the rotational force required to drive a hydraulic pump at a given pressure and flow rate. It's a critical parameter for selecting motors and designing hydraulic systems.

2. How Does the Calculator Work?

The calculator uses the hydraulic torque equation:

Where:

• \( T \) — Torque (Nm)
• \( V \) — Pump displacement (cm³/rev)
• \( P \) — Pressure (bar)
• \( \eta \) — Pump mechanical efficiency (decimal, 0-1)
• \( \pi \) — Pi (~3.1416)

Explanation: The equation calculates the theoretical torque required based on pump displacement and system pressure, adjusted for mechanical losses.

3. Importance of Torque Calculation

Details: Accurate torque calculation ensures proper motor selection, prevents overload conditions, and helps optimize hydraulic system performance.

4. Using the Calculator

Tips: Enter displacement in cm³/rev, pressure in bar, and efficiency as a decimal (e.g., 85% = 0.85). Typical pump efficiency ranges from 0.85 to 0.95.

5. Frequently Asked Questions (FAQ)

Q1: Why is efficiency important in the calculation?
A: Efficiency accounts for mechanical losses in the pump. Actual torque required is higher than theoretical due to friction and other losses.

Q2: What's a typical efficiency value?
A: Gear pumps: 0.85-0.90, vane pumps: 0.90-0.92, piston pumps: 0.92-0.95. Always consult manufacturer specifications.

Q3: How does pressure affect torque?
A: Torque is directly proportional to pressure. Double the pressure = double the torque requirement.

Q4: What about different units?
A: For imperial units (in³/rev and psi), multiply the result by 0.113 to get lb-ft torque.

Q5: Should I add a safety factor?
A: Yes, it's common to add 10-20% safety margin to calculated torque for system variations.