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Anonymous users2024-02-11There are two reasons to limit the diameter of small pulleys: one is to take into account the size of the wrapping angle. The wrapping angle is proportional to the friction force, and if the wrapping angle is too small, it will lead to belt drive slippage; The second is to take into account the life of the tape.
The smaller the diameter of the pulley, the more the tape will bend, and the tape may break in the long run.
The V-belt pulley is a V-belt pulley structure consisting of a rim, spoke, and hub. According to the spoke structure, it is divided into three types: solid pulley, spoke pulley and spoke pulley, and the common materials of V pulley are gray cast iron, steel, aluminum alloy or engineering plastics, among which gray cast iron is the most widely used.
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Anonymous users2024-02-10First of all, the life of the belt in the belt drive is related to the stress of the belt, including the bending stressσ=e*h/dThe stress size is proportional to the diameter, so for the same V belt, the smaller the diameter of the small pulley, the greater the bending stress of the belt in each transmission, the faster the fatigue damage, and the lower the belt life.
Secondly, the maximum effective pulling force of the belt drivefmax=2*f（ef´α（ef´α, where the corners are wrappedα=2arccos[(d2-d1)/2a]，Under the condition that other conditions remain the same, the smaller the diameter of the small pulley, the smaller the wrapping angle, the smaller the maximum effective tensile force of the belt drive, and the smaller the power transmitted by the belt drive. If the power transmitted does not reach the power required for the work, the belt will slip and wear, and the belt drive will fail in the long run, and the belt life will be reduced.
Therefore, there are restrictions on the diameter of small pulleys for different types of V-belts. The thicker the belt, the greater the minimum diameter of the recommended small pulley.
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Anonymous users2024-02-09When the diameter of the small pulley is too small, the wrapping angle will be too large, that is, the contact area of the belt will be too small. This will lead to a series of problems such as a large reduction in transmission power, a reduction in belt life, and a large vibration.
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Anonymous users2024-02-08It is to limit the angle of the pulley not to be too large, resulting in too small contact area with the belt.
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Anonymous users2024-02-07Hello, I am glad to answer for you: the reasons for limiting the diameter of small pulleys in belt drive are: 1
The power transmission is stable: the diameter of the small pulley is small, and its circumference is correspondingly small, and when it comes into contact with the large pulley, the linear velocity at the contact point of the pulley increases, which is easy to slip and wear. In addition, when the diameter of the small pulley is too small, it is easy to cause fatigue damage of the belt due to the small bending radius.
3.Torque transmission capacity: The diameter of the small pulley is small, and its moment of inertia is also small, so when running at high load and high speed, the small pulley cannot bear enough torque load, resulting in belt drive failure.
3.Belt drive life: The small diameter of the small pulley is small, and due to the reduction of the contact length, it is easy to produce wear and surface indentation problems, which will affect the service life of the belt drive.
Therefore, in order to ensure the reliability, stability and life of the belt drive, the diameter of the small pulley needs to be limited. <>
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Anonymous users2024-02-061. Determine the calculated power PCA (also known as the design power PD, different books have different titles) and the speed of the small pulley N1;
2. Check the ordinary V-belt selection chart, and determine the corresponding points according to the horizontal axis (calculated power) and longitudinal axis (small belt wheel speed). The band type is selected in which band model the attraction is located.
3. After determining the belt type, check the table to determine the diameter of the primary selection of small pulleys (the diameter of the primary selection of small pulleys should be greater than the minimum reference diameter). The name of this table is "Standard Diameter Series for Ordinary V-Pulleys".
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Anonymous users2024-02-05The diameter of the large pulley crack calculated according to the transmission ratio must be rounded to the benchmark diameter value of the pulley specified in the national standard, and there will generally be no decimal.
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Anonymous users2024-02-04There are two reasons to limit the diameter of the small pulley: one is to consider the large cover angle and the small hail. Wrapping angle and friction.
proportional, and the wrapping angle is too small, which will lead to belt drive slippage; The second is to take into account the life of the tape. The smaller the diameter of the pulley, the more the tape will bend, and the tape may break in the long run.
The V-belt pulley is a V-belt pulley structure consisting of a rim, spokes and hub.
Compose. According to the spoke structure, it is divided into three types: solid pulley, spoked pulley and spoke pulley, and the common material of V-belt pulley is gray cast iron, steel, aluminum alloy or engineering plastics.
etc., among which gray cast iron is the most widely used in silver.
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