What is the meaning of "torque"?

Question

What is the meaning of higher torque or lower torque in engine vehicle performance?

Answer 1

Torque is part of the basic specification of an engine: the power output of an engine is expressed as its torque multiplied by its rotational speed. Internal-combustion engines produce useful torque only over a limited range of rotational speeds (typically from around 1,000–6,000 rpm for a small car). The varying torque output over that range can be measured with a dynamometer, and shown as a torque curve. The peak of that torque curve usually occurs somewhat below the overall power peak. The torque peak cannot, by definition, appear at higher rpm than the power peak.

Understanding the relationship between torque, power and engine speed is vital in automotive engineering, concerned as it is with transmitting power from the engine through the drive train to the wheels. Typically power is a function of torque and engine speed. The gearing of the drive train must be chosen appropriately to make the most of the motor's torque characteristics.

(torque can informally be thought of as "rotational force" or "angular force" which causes a change in rotational motion. This force is defined by linear force multiplied by a radius. The SI units for Torque are newton metres. In the U.S., foot-pounds force (ft·lbf) are also commonly encountered. The symbol for torque is τ, the Greek letter tau. The concept of torque, also called moment or couple, originated with the work of Archimedes on levers. The rotational analogues of force, mass, and acceleration are torque, moment of inertia, and angular acceleration respectively. The force applied to a lever, multiplied by its distance from the lever's fulcrum, is the torque. For example, a force of three newtons applied two metres from the fulcrum exerts the same torque as one newton applied six metres from the fulcrum. This assumes the force is in a direction at right angles to the straight lever.)

torque can be defined as the rate of change of angular momentum.

Answer 2

TORQUE: The measure of the force applied to a member to produce rotational motion (Imperial units = foot-pounds, Metric units = Newton-meters). Torque is determined by multiplying the applied force (pounds or Newtons) by the distance (feet or meters)from the pivot point to the point where the force is applied.

Another way to look at this is that torque is the useful mechanical output, given the inputs of power and rotation.

Higher torque means either more power (at the same speed), or a larger distance between pivot and force application (at the same power).

Since ~most~ drive trains use a fairly standard set of shaft diameters, the variable is usually horsepower. These shafts are typically sized for a range of power throughput - often as much as a 25 percent swing from low to high. Thus the same shaft might be used for both a 100 hp and a 125 hp engine.

All internal combustion engines have both a "power curve" and a "torque curve". The peak horsepower is achieved at a certain running speed ... somewhat below the "redline" value for the engine. Between the power peak and the redline, peak torque is developed.

Torque is, ultimately, the ability to turn something. Variations in torque transmission are required to keep engines operating close to optimum efficiency on the power curve - hence the use of automatic or manual transmissions to "shift gears". The engine runs at similar rpm, but the size of the connecting plate (and hence the amount of torque transmitted) is variable. At higher "road speeds", the connecting plate is smaller in diameter, thereby transmitting less torque.

I think this answers your question.

Answer 3

Torque is the ability of the engine to continue to twist (rotate) the rear wheel with great force. Torque has nothing to do with speed. Maximum torque is not to be found at the highest revs but somewhere below that - perhaps as much as 25%. Because lower revs are involved, the rear wheel is less inclined to spin and loose traction - an important issue when riding your bike up a steep gravel road.

Answer 4

Torque is turning/rotational force. Basically in vehicle terms the higher your torque is, the better, because it indicates how much power is generated by your engine to turn the main axle or your car, and this main axle drives your wheels.

Answer 5

torque is the product of force and distance(ie radius etc) and its unit is Nm.higher torque in the sense the shaft is rotating at more rpm which means there is less load on the shaft and vice versa

Answer 6

Torque is "rotational force". It is used to cause a change in angular velocity.

Mathematically, T (small Greek letter tau) = r (distance from center of rotation) x F (force being applied).

Answer 7

the turning effect is called torque

Answer 8

For our lives to have meaning you gotta be able to rim the angry bull billy no what im sayinnnnnn daaarddddd nyooorn

Answer 9

Simply, force multiply by radius.