The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 1976
Filed:
Mar. 13, 1975
Charles R Gerlach, San Antonio, TX (US);
Rineer Hydraulics, Inc., Corpus Christi, TX (US);
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.