Pump system for cryogenic liquid delivery vehicles

A pumping system for cryogenic liquid delivery vehicles that include a tractor and trailer that is substantially longer than the tractor having forward and rear ends comprising;

• self-contained internal combustion engine means having control means associated therewith,
• means for mounting the internal combustion engine means at a forward end of the trailer remote from the rear end of the trailer,
• hydraulic pump means also mounted at the forward end of the trailer operatively coupled from and operated by the internal combustion engine means, and having control means for varying the displacement of said hydraulic pump means including a manually-operated control member,
• said hydraulic pump means operating up to 60 horsepower at speeds up to 4000 r.p.m.,
• a reservoir coupled to the hydraulic pump means,
• hydraulic motor means,
• means for mounting the hydraulic motor means at the rear end of the trailer,
• said hydraulic motor means including a high speed hydraulic motor capable of transmitting up to 60 horsepower at speeds up to 7500 r.p.m.,
• hydraulic fluid line means intercoupled between the hydraulic pump and hydraulic motor means and forming therewith a closed loop hydrostatic transmission system including a main flow line and a return line carrying a hydraulic fluid that is a phosphate-ester composition,
• means defining an enclosed cabinet at the rear end of the trailer having a control panel,
• said hydraulic pump control member and internal combustion engine control means being disposed in said cabinet and associated with said control panel,
• and a cryogenic liquid pump means disposed at the rear end of the trailer adjacent the hydraulic motor means and driven from the hydraulic motor means,
• said liquid pump means for pumping cryogenic liquid from the vehicle,
• safety barrier means separating the hydraulic motor means and liquid pump means,
• said internal combustion engine means being disposed for safety purposes sufficiently remote from said cryogenic liquid pump means.