| CPC F04B 1/1071 (2013.01) [F04B 1/0452 (2013.01); F16N 13/02 (2013.01)] | 5 Claims |
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1. An oil pump comprising:
a support having a guide extending around an axis, a radial position of the guide relative the axis varying around the axis, between a maximum radial position and a minimum radial position, and a first oil passage extending through the support;
a rotary assembly mounted to the support via support bearings, and rotatable around the axis, the rotary assembly having a second oil passage and a cylinder, the cylinder extending radially relative to the axis, an inlet port fluidly connecting the first oil passage to the cylinder, and an outlet port fluidly connecting the cylinder to the second oil passage, the outlet port at a radially-inner end of the cylinder;
a piston slidingly mounted in the cylinder, a radially-outer end of the piston slidingly engaged with the guide, wherein when the piston is engaged with the maximum radial position of the guide, the inlet port is uncovered by the piston and open, and wherein when the piston is engaged with the minimum radial position of the guide, the inlet port is covered by the piston and closed; and
a one-way valve at the outlet port, the one-way valve preventing passage of oil from the second oil passage to the cylinder while yielding to pressure and allowing passage of oil from the cylinder to the second oil passage, the one-way valve having a ring engaged in a radially-inwardly facing annular groove formed in the rotary assembly, the ring and the annular groove extending around the axis, the outlet port being in fluid flow communication with the annular groove, the ring being radially-outwardly biased against the annular groove to close the outlet port and configured to yield to oil pressure from the outlet port.
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