Patent ID: 7469536

Claim:
Hydraulic transmission system, comprising: a supply means adapted to supply a variable flow rate of hydraulic working fluid; said supply means having a hydraulic adjustment device for adjusting the variable flow rate of the hydraulic working fluid; an actuatable hydraulic control having an actuated condition in which the actuatable hydraulic control generates a hydraulic control fluid having a control pressure which is adjustable between a first control pressure and a second control pressure, the first control pressure and the second control pressure supplying hydraulic control fluid and being associated with respective first and second modes of operation of the hydraulic transmission system; a first connection control operable by said hydraulic control fluid supplied from said actuatable hydraulic control and adapted to direct, upon actuation of said actuatable hydraulic control, said hydraulic control fluid to said hydraulic adjustment device, said first connection control including a distributor connected to said hydraulic adjustment device, said distributor having a control position in which it directs said hydraulic control fluid to said hydraulic adjustment device upon actuation of said actuatable hydraulic control, said distributor further having a neutral position in which it connects the hydraulic adjustment device to a hydraulic fluid tank; at least two working lines receiving said hydraulic working fluid at variable flow rate from said supply means; at least two hydraulic users connected to said supply means via said at least two working lines in a closed circuit configuration; a second connection control adapted to control the connection of working line portions connected to the at least two users; and said actuatable hydraulic control being adapted to generate a control signal indicative of pressure of the hydraulic working fluid supplied by said supply means, wherein said second connection control is responsive to said control signal so as to selectively provide serial and/or parallel connection of the at least two hydraulic users by selectively connecting said working line portions, and wherein said control signal is the hydraulic control fluid with variable pressure supplied by said actuatable hydraulic control.