Rotary expansible chamber devices – Working chamber surface expressed mathematically
Patent
1975-03-13
1976-05-18
Vrablik, John J.
Rotary expansible chamber devices
Working chamber surface expressed mathematically
418221, F01C 100, F03C 300, F04C 100
Patent
active
039574040
ABSTRACT:
In a fluid power converter, such as a hydraulic pump or motor, having a rotor and stator with vanes in both the rotor and stator, the improvement in the vanes which are generally rectangular in cross section in which the outer edges of the vanes have a convex curvature of an extent to prevent the sides of the vanes of the rotor and stator from locking on one another upon rotation. However, the curvature is limited to avoid undesirable detenting as the rotor vanes cross the stator vanes. In addition, the maximum slope of the convex curvature is equal to or exceeds the maximum slope of the peripheral surface on the rotor or stator with which the vanes coact to prevent having sharp corners on the vanes which would engage the stator and rotor peripheries and produce rapid wearing of the vanes as well as the peripheries of the stator and rotor which they contact.
The radial extent of the convex shape of the stator vanes plus the radial extent of the convex shape of the rotor vanes is provided for being at least equal to the minimum radial clearance between the rotor and stator thereby preventing the rotor and stator vanes from catching on each other during rotation. In addition, the radial extent of the convex shape of the stator vanes plus the radial extent of the convex shape of the rotor vanes is no greater than twice the minimum radial clearance between the rotor and stator thereby preventing undesired detenting between the rotor and stator vanes during rotation.
REFERENCES:
patent: 868841 (1907-10-01), Calkins
patent: 3609071 (1971-09-01), Brown
Rineer Hydraulics, Inc.
Vrablik John J.
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