Orbital transmission with geared overdrive

Patent No. 7,475,617

Issued: January 13, 2009
Filed: June 15, 2005

Inventors: Gleasman; James Y. (Rochester, NY), Gleasman; Keith E. (Fairport, NY), Wrona; Matthew R. (Fairport, NY) 
Assignee: Torvec, Inc. (Rochester, NY)


The transmission includes an orbital gear complex in combination with a variable hydraulic pump and motor. The input to the transmission is increased in speed by the orbital gearing such that, when the pump and motor are not operating, the orbiter is stationary, and the orbital gearing produces an overdrive condition. A gear reduction is accomplished by rotating the web with the web-rotating device, providing a high gear reduction. The pump and motor are preferably long-piston hydraulic machines with infinitely variable swash plates. The hydraulic machines preferably have wobblers stabilized by full gimbals and hold-down plates with elongated holes for the long pistons to eliminate possible impacts between the hold-down plates and the head ends of the long pistons when the swash-plates are at or near their maximum angle of inclination.

Reference to Related Applications

The subject matter of this application is related to the subject matter in co-pending U.S. patent application Ser. No. 10/789,739, entitled "LONG-PISTON HYDRAULIC MACHINES", filed Feb. 27, 2004. This application is herein incorporated by reference. The subject matter of this application is also related to the subject matter in co-pending application entitled "DUAL HYDRAULIC MACHINE TRANSMISSION", filed on the same day as the present application. This application is herein incorporated by reference.


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