Long-piston hydraulic machines
Patent No. 6,983,680
Issued: January 10, 2006
Inventors: Gleasman; Vernon E. (Pittsford, NY); Gleasman; Keith E. (Fairport, NY); Wrona; Matthew R. (Fairport, NY)
Smaller and lighter hydraulic pump/motors provide remarkably improved volumetric efficiency with pistons having body portions substantially as long as the axial length of the respective cylinders in which they reciprocate. A plurality of respective lubricating channels form a single, continuous lubricating passageway entirely within the cylinder block and not connected by either fluid "input" or fluid "output" passageways, being replenished solely by a minimal flow of fluid to and from the valve end of each cylinder and passing between each respective cylindrical wall of each cylinder and the axial cylindrical body of each respective piston. Several embodiments are disclosed in combination with various spring-biased hold-down assemblies. The preferred embodiment included a fixed cylinder block, a roller bearing mounting between the wobbler and rotor of a split-swash plate, with piston shoes contacting the wobbler directly without any intermediary apparatus.
REFERENCE TO RELATED APPLICATIONS
This application is a Continuation-In-Part of U.S. parent application Ser. No. 10/229,407 filed 28 Aug. 2002 now abandoned and Continuation-In-Part Application Ser. No. 10/647,557 filed 25 Aug. 2003, now abandoned, which applications are hereby incorporated by reference.
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