Long piston hydraulic machines
Patent No. 7,635,255
Issued: December 22, 2009
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 includes 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 is a divisional patent application of application Ser. No. 10/789,739, filed Feb. 27, 2004 now U.S. Pat. No. 6,983,680, entitled "LONG-PISTON HYDRAULIC MACHINES", which was 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. These applications are hereby incorporated by reference.
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