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Calculation of SS gear oil pump flow and flow formula
Flow of gear oil pump
1. In theory, the volume of oil brought to the discharge cavity should be equal to the working volume between teeth
2. The Qt per revolution should be the sum of the working volumes of all the teeth between the two gears.
3. It can be assumed that the working volume between the teeth is equal to the effective volume of the teeth.
4. Qt per revolution
1) is the sum of the working volume between the teeth of a gear and the effective volume of the gear teeth
2) An annular volume with a radial width of 2m (m is the modulus) swept by the effective part of the tooth
(2) Flow formula of Stainless steel gear oil pump
When using the above to calculate the pump Qt, the value is too small
The correction factor K should be multiplied. The average Qt is:
In the formula: D——The diameter of the dividing circle, mm;
m——modulus, mm;
B——tooth width, mm;
n——speed, r/min;
K-correction factor, generally 1.05 to 1.15.
Medium and low pressure gear oil pump formula for flow
Increase the gear diameter, tooth width, speed n and reduce the number of teeth.
n Too high will cause the gear teeth to pass through the suction chamber for too short a time
The increase of n and diameter increases the circumferential speed of the gear and the centrifugal force increases
1. Increasing the difficulty of suction, the oil pressure p at the tooth root is reduced, and gas may be precipitated, resulting in a decrease in Q, causing vibration and noise, and even making the pump unable to work.
2. Therefore, the peripheral speed should be limited according to the viscosity of the oil delivered.
1) The peripheral speed should not exceed 5～6m/s,
2) High speed is generally around 3000r/min.
Increasing the tooth width will increase the radial force, the contact line of the tooth surface will be longer, and it is not easy to maintain a good seal.
Although reducing the number of teeth can increase the volume V between the teeth and increase Q, but it will increase the unevenness of Q
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