What is the driving force of a belt?

Circumferential force in the belt. In belt drives, forces are transmitted from the input pulley to the belt and then from the belt back to the output pulley. The force to be transmitted from one pulley to the other is also referred to as the effective force or circumferential force Fc.

What is the advantage of using a flat belt?

Advantages of Flat Belt Drive. The flat belt drives are simple, less expensive, flexible, and durable. 2. This belt drive gives better performance at high speeds and is more economical to use.

Does belt drive use friction?

An analysis of the frictional mechanics of a steadily rotating belt drive is carried out using a physically appropriate creep-rate-dependent friction law. Unlike in belt-drive mechanics analyzed using a Coulomb friction law, the current analysis predicts no adhesion zones in the belt-pulley contact region.

What is lap angle in belt friction?

Angle of Lap : The angle of lap is defined as the angle subtended by the portion of the belt which is in contact at the pulley surface of the pulley.

What are the 2 types of drive belts?

There are three types of drive belts:

• Serpentine Belt. A serpentine belt is located under the hood of a car, and it “snakes” its way between various pulleys and accessories.
• V-Belt. A V-belt runs off a crank and pulley and typically travels between one or two engine accessories.
• Timing Belt.

Which belt drive is more power transmission at same coefficient of friction?

V-belt drive
In V-belt drive, two side surfaces of the belt remain in contact with the pulleys. Power transmission capacity of flat belt is comparatively lower due to higher chance of slip. V-belt can transmit more power without slip due to increased friction. It is recommended for long distance power and motion transmission.

Where are flat belts used?

The flat belt as shown in Fig. 18.1 (a), is mostly used in the factories and work- shops, where a moderate amount of power is to be transmitted, from one pulley to another when the two pulleys are not more than 8 metres apart.

What is the disadvantage of flat belts?

Disadvantage of the flat belt drive High chance of slip off. Flat belts are not advisable for high outputs at high speeds. The flat belt cannot transmit high power as timing belt does. They are bulky, for a given transmission, flat belt drive requires a wide pulley.

Why V belt is transmitted more power than flat belt for the same coefficient of friction μ )? Explain it mathematically?

When it is desired to transmit motion from one shaft to several shafts, all arranged in parallel, a belt drive with many idler pulleys, as shown in Fig. 7, may be employed. Figure 6: Belt drive with single idler pulley. Figure 7: Belt drive with many idler pulleys.

What are the factors upon which the coefficient of friction between the belt and the pulley depends?

The coefficient of friction between the belt and the pulley depends upon the following factors:

• The material of belt;
• The material of pulley;
• The slip of belt; and.
• The speed of belt.

What is the force of friction on a sliding body?

The force arises from the fact that the surfaces, though planed and made smooth, have ridgesand depressionsthat interlock and the relative movement is resisted (Fig. 3.1). Thus, the force of friction on a body is parallel to the sliding surfaces and acts in a direction opposite to that of the sliding body (Fig. 3.2).

What are the total forces due to pressure and friction?

The total forces due to pressure and friction (P and F) are evaluated in magnitude and direction. It is shown that not only the local friction force is proportional to the local pressure (f=μp), but also their resultants (F=μP), where μ is the coefficient of static friction.

What is the wrap angle of a belt?

r  A flat belt has a wrap angle around a pulley of θ radians. Normal forces develop at each finite point of contact with a resulting frictional force acting tangent to the pulley and opposite the direction of rotation.

When friction force is less than static friction force?

Now, if the body moves over the plane surface, it is observed that the friction force will be slightly less than the static friction force. As long as the body moves with a uniform velocity, the force F required for the motion of the body will be equal to the force of friction on the body.