It is self-evident that the belt is slippery. As the belt moves from the loose side to the tension side, creep occurs during elongation or stretching, which causes the belt to move away from the gear sheave a little longer than it enters. Because the V-belt profile thickness is typically larger than the synchronous drive belt, they use more energy as they bend around the drive sheave. In addition, the V-belt and the transmission sheave are operated by the wedging action to generate friction. The heat loss caused by this wedging action is generally greater than the frictional friction of the timing belt into and out of the sprocket. Especially when the maintenance is not good, the V-belt drive must slip, causing higher heat generation and energy loss. Synchronous belts rely on a tight meshing principle without slipping. Therefore, the V-belt drive must decrement in the transmission speed, while the synchronous drive does not. The V-belt drive can run at up to 95%-98% when it is installed, but even if it is properly maintained, it will deteriorate during operation, which is about 5% lower. Poorly maintained V-belt drive efficiency is reduced by 10%. The synchronous drive belt maintains energy efficiency of around 98% throughout its life.

Few drive maintenance can achieve the optimum level of belt tension. Over time, the V-belt tension is reduced to such an extent that if the tension is not properly re-adjusted, the belt will slip and affect efficiency. Synchronous belts are small even if they need to be re-adjusted due to their high tensile stress and low tensile elongation of the cord. For example, the 2450mmV belt is approximately 381163.5mm centered over its life span, while the synchronous belt only needs to be tensioned 1102mm. Synchronous belt efficiency is not always higher than the V belt. 1 HVAC Drive Design Considerations While HVAC applications are a natural choice for conversion to timing belt drives, care must be taken to ensure that the HVAC unit is a good choice for this type of conversion. Air conditioning equipment is usually designed by the original manufacturer and naturally adopts V belt transmission.

Here are some guidelines for easily following the conveyor belt to identify good or bad when selecting the object to be converted. Many air conditioning treatment devices are not particularly robust in construction. This is not a major concern for V-belt drives. However, the synchronous drive belt is sensitive to changes in the center distance caused by insufficient bracket strength. This is especially important when an AC motor is required to provide 150% 200% rated power. Under these conditions, the V-belt is easy to slip, like a clutch, and is actually locked to the torque peak at start-up. However, the timing belt does not slip, but a higher starting torque must be transmitted. If the center distance is reduced to a large extent, it is enough to cause the timing belt to reverse the teeth and possibly damage the belt and the motor or fan at the same time. When checking whether a transmission can be switched to a synchronous belt, the transmission can be closed and safely braked. It is tested in a simple way: grasp the two belts in the middle of the span and push them together, paying attention to their movement. In case, be aware that there is relative motion between the motor or the center distance, and if so, most of the transmission may not be structurally strong.

The structure needs to be reinforced to get the highest performance from a synchronous belt drive. The best choice for this type of conversion is when the motor is securely mounted on a mounting bracket that is part of the fan mounting bracket system. A common configuration is that the motor is mounted on the fan. The firm mounting of the motor and fan on the same frame is a good choice for switching to a synchronous belt. The complete set of equipment (including the motor and fan) is mounted on a pedestal that is isolated from vibration. If the motor and fan are mounted independently on their own vibration isolating springs, the center distance will change during operation, resulting in premature wear and damage to the synchronous belt. When the motor is mounted on a steel box with a fan, the system is generally not very strong. The inside of the steel box should be carefully inspected. If there are no structural components, it is usually necessary to add them, and a simple reinforcing member such as an angle iron is provided at a position where the motor mounting components can be firmly supported to convert such a transmission into a synchronous belt transmission. The double-bolt motor base is the ideal choice for use with synchronous belts, as it is easier to adjust and align and is more secure. The single-bolt motor base can cause motor misalignment and reduce the overall synchronous belt drive performance.

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