| 摘要 |
A lobed rotor pump, annular piston pump or spiral piston pump is proposed, in which the crank pin bearing is sealed in the piston by externally sealing lip packings fixed to the crank pin, the condition that the crank radius e is smaller than the running face radius r for the sealing lips minus the sealing lip length l (e < r-l) ensuring that the contact force of the sealig lips is increased by centrifugal force.
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