Torque is mechanical force

Torque is a moment of force

Torque is noted with Mt and the practical unit is Nm

Hydraulic torque is a turning effort or twisting force. An example which for me it was conclusive a 10 kg-m torque is produce when a force of 10 kg is apply to a 1 m long wrench.

1 m long wrench applied 10kg = 10kg-m torque

This is the principle applied to the operational of a hydraulic motor. For a given pressure, motors are rated at specific torque values.

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Torque is a turning effort

The torque produced by the motor is dependent on the displacement and pressure drop at the motor.

The force of the hydraulic motor which acts on the drive shaft causes an output hydraulic torque. Force produced is from resulting pressure and piston area.

So a resisting object attached to a motor shaft generates a torque. This is a resistance for a motor, which must be overcome by hydraulic pressure acting on a motor’s rotating components.

Nowadays I revise my old article, service report and I remember my experiences on board commercial or offshore vessels as hydraulic troubleshooter

Hydraulic motors have certain advantages over electric motors, one of these is:

Torque control throughout its operational speed.

Therefore means that the torque depends of the pressure * p = F x A. In a hydraulic system pressure acting on motor’s parts is state by the load. Therefore the load and pressure is changeable and with that torque becomes controllable.

I open a discussion about “Hydraulic motors have certain advantages over electric motors, one of these is, torque control throughout its operational speed” topic and what I thing means. Check others what they saying…

Hydraulic Torque is a twisting force

10 kg-m torque is produce when a force of 10 kg is apply to a 1 m long wrench;
A load attach to a motor shaft generates a torque;
For a given pressure, motors are rated at specific torque values.
When a machine malfunctions the primary objective is to be able to identify which of its functions is no longer works. Then will be evident which component is faulty.

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3 Comments

Rob Van Den Brink February 13, 2023 at 2:19 PM

Torque is a moment,
Torque is not a force but a moment. So when we are talking about a linear movement we talk about a force (N), when we are talking about a rotation we talk about torque (Nm). The unit of Torque in SI is Nm. The torque a hydraulic motor can generate depends on the pressure difference and motor displacement and is independent of the speed. Axial piston motors often have a low starting torque.Radial piston motors like Hägglunds have a starting torque of about 95% and can be used for direct drive operation.
An electric motor has a Torque that is depending on speed (depending on the type of motor)
GVtroubleshooter February 14, 2023 at 10:35 AM

I found in a Parker Hydraulics training course this:

Hydraulic motors have certain advantages over electric motors, one of these is:
– Torque control throughout its operational speed.

What does it means practically?

Torque is automated control during hydraulic motor operation.
Clutch mechanism - Hydraulicstroubleshooter May 26, 2024 at 9:10 PM

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