Patent ID: 9599108
Date: 2017-03-21
CPC Classifications: F04C

Claim:
1. A vane pump comprising: a first cam ring and a second cam ring; a first rotor positioned in the first cam ring and a second rotor positioned in the second cam ring; a shaft, the first rotor being engaged with the shaft so that the first rotor rotates relative to the first cam ring about an axis extending through the shaft, and the second rotor being selectively engaged with the shaft so that the second rotor selectively rotates relative to the second cam ring about the axis; a piston positioned in the shaft, the piston configured to translate within the shaft between a first positon and a second position, wherein in the first position, the shaft engages with the second rotor so that the second rotor rotates relative to the second cam ring about the axis, and in the second position, the shaft disengages with the second rotor so that the second rotor does not rotate relative to the second cam ring; further comprising a dog clutch positioned about the shaft, the shaft engaging and disengaging with the second rotor with the dog clutch.