In order to make the gear of gear pump mesh smoothly, seal the suction oil chamber strictly and supply oil evenly and continuously, the overlap coefficient r of gear meshing must be made () 1.
A. greater than
B. equal to
C. less than
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There are three leakage ways in CB-B gear pump and _________ has the greatest impact on volumetric efficiency. ()
A. gear end clearance
B. gear tip clearance
C. gear base clearance
D. A + B + C
The features of external gear pump include ().
A. the structure is compact and the flow rate is easy to adjust
B. the method of reducing the oil inlet is usually used to reduce the radial imbalance force
C. the noise is small, the oil delivery is uniform, the volume is small and the weight is light
D. low cost, reliable work, weak self-priming ability, mostly used in low-pressure system
Which type of displacement is observed in gear pumps?
A. only variable displacement
B. only fixed displacement
C. both fixed and variable displacement
D. none of the above
What causes suction of fluid into the gear pump?
A. pressure drops during disengagement of teeth at the suction side
B. pressure increases during disengagement of teeth at the suction side
C. pressure drops during engagement of teeth at the suction side
D. pressure increases during engagement of teeth at the suction side
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