Patent ID: 7955202
Filing Date: 2011-06-07
Classification: F16H,Y10T

Abstract:
1. A continuously variable cone disc transmission comprising: a drive shaft; a driven shaft; a first pair of cone discs received on said drive shaft such that one cone disc of said first pair of cone discs is fixed to said drive shaft and such that the other cone disc of said first pair of cone discs is axially movable on said drive shaft; a second pair of cone discs received on said driven shaft such that one cone disc of said second pair of cone discs is fixed to said driven shaft and such that the other cone disc of said second pair of cone discs is axially movable on said driven shaft; a traction training means extending between said first and second pairs of cone discs for transferring power between said first and second pairs of cone discs; a first piston-and-cylinder assembly connected to said drive shaft; a second piston-and-cylinder assembly connected to said driven shaft; a pumping means connected to said first and second piston-and-cylinder assemblies for setting a transmission ratio therebetween by supplying a pressurized fluid thereto; a control valve fluidically cooperative with said pumping means, said control valve being a square spool valve, said control valve comprising: a proportional pressure reducing valve fluidically connected between said pumping means and said control valve so as to supply the pressurized fluid to said piston valve, said piston moving to said second position when a loss of pressure of the pressurized fluid occurs.