What is the power transmitted by belt drive?
The belt transmits power by friction only. The belt drive system can be used for long center-to-center distance of the shaft. For effective transmission, friction between the pulley surface and the belt surface should be as high as possible.
How angle of contact affects the power transmission through belt drive?
The angle of lap may be defined as the angle of contact between the belt and the pulley. With the increase in angle of lap, the belt drive can transmit more power. Along with the increase in angle of lap, the idler pulley also does not allow reduction in the initial tension in the belt.
How is power transmitted by belt drive calculated where T1 T2?
The effective turning (driving) force at the circumference of the follower is the difference between the two tensions (i.e. T1 – T2). Therefore, Power transmitted is given by P = (T1 – T2) v ————- Watts.
Which drive is used for power transmission without slip?
Answer is “chain drives”
What is the principle of power transmission in a belt drive why do we have a tight side and slack side in a belt drive?
By increasing the belt forces, safety against slippage can be increased or larger circumferential forces can be transmitted. The tension in the two spans of the belt (slack side and tight side) is influenced by the pre-tensioning of the belt (initial tension).
How many types of power transmission are there?
4 Types of Power Transmission – Mechanical, Electrical, Hydraulic and Pneumatic (Pros & Cons) The transmission method is an engineering method that matches the power machine and the working part of the machine in terms of energy configuration, movement speed and motion form.
What are the factors which affect the power transmission capacity of belt drive?
Power transmitted in a belt-drive depends on the following factors:
- The linear velocity of the belt.
- Tension under which belt is placed on the pulleys.
- The contact area between the belt and the smaller pulley. The contact area is measured by measuring the arc of contact between the belt and pulley.
What is belt angle?
The angle subtended by the belt on the pulley is know as angle of contact or arc of contact. For better performance the angle of contact should be between 90° to 170°. To increase the angle of contact idler pulleys can be used.
How do you calculate power transmitted by shaft?
The power transmitted by the shaft is:
- P = 2 π N T 60 × 1000.
- P = 2 π N T 30 × 1000.
- P = 2 π N T 30.
- P = 2 π N T 1000.
- P = 2 π N T 2000.
Which belt drive has no slip?
Flat belts are the purest form of friction drive while V-belts have a friction multiplying effect because of wedging action on the pulley. Positive drive or synchronous belts rely on the engagement of teeth on the belt with grooves on the pulley. There is no slip with this belt except for ratcheting or tooth jumping.
What are the types of belts used in power transmission?
There are flat belt and V- belt used for the power transmission. Open belt drive: – for parallel shafts and to be rotated in the same direction as that of the driver shaft. The driver pulley pulls the belt from one side and delivers it to the other side.
What are the different types of power transmission?
The following are the major types of power transmission. 1 Belt drive, 2 Rope drive, 3 Chain drive, 4 Gear drive BELT DRIVE: – This type of drive is used when the power is to be transmitted from one shaft to other which is at a distance.
Why belt drive is not a positive drive?
In case of belts, friction between the belt and pulley is used to transmit power. In practice, there is always some amount of slip between belt and pulleys, therefore, exact velocity ratio cannot be obtained. That is why, belt drive is not a positive drive.
What is the difference between belt drive and gear drive?
Belts, chains and gears are used for this purpose. When the distance between the shafts is large, belts or ropes are used and for intermediate distance chains can be used. For belt drive distance can be maximum but this should not be more than ten metres for good results. Gear drive is used for short distances.