| 摘要 |
<p>A trochoidal gear pump or engine (10) uses a coaxial hub (28 and 42) with the outer and/or inner rotor (20 and 40) and an associated rolling element bearing assembly (30, 31, and 43) that preferably uses preloaded bearings to precisely set the rotational axis and/or the axial position of the rotor with which it is associated. This allows the fixed-gap clearance (X, Y, Z, U, W, and V) between the rotor surfaces (9, 26, 29, and 54) and the housing surfaces (19) or the other rotor surfaces to be set at a distance that minimizes operating fluid shear forces and/or by-pass leakage and eliminates gear tooth wear thus preserving effective chamber to chamber sealing (218). The device is useful in handling gaseous and two-phase fluids in expansion/contracting fluid engines/compressors and can incorporate an output shaft that accommodates an integrated condensate pump for use with Rankine cycles. A vent from the housing cavity to a lower pressure input or output port (15 and 17) regulates built-up fluid pressure in the housing thereby optimizing the efficiency of the device by controlling bypass leakage.</p> |
