What are the characteristics of belt drive

       Belt driveIt is a mechanical transmission that relies on friction to transmit motion and power. Belt drives are widely used. I don't know if you know its characteristics and advantages and disadvantages. Next, let's look at the belt drive.

Main features of belt drive:

The belt has good elasticity, which can reduce the impact and vibration during work, and the movement is stable and no noise. When the load is too large, the belt slips on the wheels, which can prevent damage to other parts and play a safety protection role. The belt is the middle part. It can select the length within a certain range according to the needs to adapt to the working conditions with large center distance requirements. Simple structure, easy manufacture, convenient installation and maintenance, low cost.

The advantages of belt drive are:

1. Belt drive is suitable for transmission occasions with large center distance between two shafts.

2. The belt has good elasticity, smooth transmission and no noise during work, and can buffer and absorb vibration.

3. If overloaded during work, the belt will slip on the pulley, which can prevent damage to the weak part and play a role of safety protection.

4. Low cost, simple structure, easy manufacture, low cost, no lubrication, buffering, shock absorption, convenient installation and maintenance, etc.

5. The belt is the middle part. It can select the length within a certain range according to the needs to adapt to the working conditions with large center distance requirements.

The disadvantages of belt drive are:

1. It is driven by friction and cannot transmit high power. Sliding into the transmission does not guarantee an accurate transmission ratio.

2. Sliding loss: When the belt is working, the tension difference on both sides of the pulley and the corresponding deformation difference form elastic sliding, resulting in speed loss between the pulley and the driven pulley. Elastic slip is related to load, speed, pulley diameter and belt structure. Some belt drives have geometric slip. Overload will cause slippage, make the belt movement in an unstable state, drop efficiency sharply, increase wear, and seriously affect the life of the belt.

3. Hysteresis loss: The belt will expand and contract repeatedly during operation, especially the winding on the pulley will cause friction in the belt body and cause power loss.

4. Air resistance: When driving at high speed, the wind resistance in motion will cause torque loss, and the loss value is proportional to the square of the speed. Therefore, when designing a high-speed belt drive, the surface area of the belt should be small, try to use a thick and narrow belt, the spoke surface of the pulley should be smooth, or use a spoke plate to reduce wind resistance.

Belt drive classification

According to different uses, belt drives can be divided into general industrial belts, automobile belts, agricultural machinery belts and household appliance belts. Friction transmission belts are divided into flat belts, V belts (also known as V belts) and special belts (V-ribbed belts and synchronous belts) according to their cross-sectional shapes.

The stress of the belt drive during operation is as follows:

1. Stress caused by tight edge and loose edge tension;

　　2.Drive BeltThe bending stress caused by the bending of the upper belt.

Cut three samples with a length of 250 mm from one PJ V-ribbed belt, and mark a marking line with a spacing of 100mm at the middle position of the PJ V-ribbed belt. When more than three samples cannot be taken from one PJ V-ribbed belt, samples can be cut from the same batch of PJ V-ribbed belt, but must be indicated in the report. 7.4.2 High temperature resistance test method
Place the sample at 100 ℃ ± 2 ℃ for 96 h ± 1 h and then take it out. After standing at laboratory temperature for more than 2h, bend it along a cylinder with a diameter of 20 mm at a contact angle of at least 90 °.