US2008302422A1PendingUtilityA1

Power output in hydraulic systems

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Assignee: ROHMAX ADDITIVES GMBHPriority: Jun 7, 2007Filed: Jun 7, 2007Published: Dec 11, 2008
Est. expiryJun 7, 2027(~0.9 yrs left)· nominal 20-yr term from priority
Inventors:Christian D. NeveuDouglas G. PlacekSteven Neil Herzog
Y10T137/0329C10M 2209/084C10M 171/02C10M 2209/103C10M 2205/04C10M 2203/1006C10M 2209/1045C10N 2030/00C10M 2207/282C10M 2209/0863C10M 2205/173C10M 2207/28C10M 2223/00C10N 2040/08C10N 2030/02C10M 2207/2805C10M 2203/1025C10M 2209/0845C10M 2207/401C10M 2205/02C10M 2209/086C10M 2205/0206C10M 2207/283C10N 2020/04C10M 2223/0405C10N 2020/02
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Claims

Abstract

The power output of a hydraulic system is improved by operating the hydraulic system with a hydraulic fluid having a VI of at least 130.

Claims

exact text as granted — not AI-modified
1 . A method of improving a power output of a hydraulic system, comprising:
 operating said hydraulic system with a hydraulic fluid having a VI of at least 130.   
   
   
       2 . The method according to  claim 1 , wherein said power output is increased at least 3% compared to the power output of a hydraulic system using a monograde hydraulic fluid having a VI of about 100, operating at the same pressure and temperature with identical mechanical power input from the engine or electric motor. 
   
   
       3 . The method according to  claim 1 , wherein said power output is increased at least 5% compared to the power output of a hydraulic system using a monograde hydraulic fluid having a VI of about 100, operating at the same pressure and temperature with identical mechanical power input from the engine or electric motor. 
   
   
       4 . A method of improving a volume output of a hydraulic system, comprising:
 operating said hydraulic system with a hydraulic fluid having a VI of at least 130;   wherein the volume output of said hydraulic system is increased compared to the volume output of a system using a monograde hydraulic fluid having a VI of about 100, operating at the same pressure and temperature with identical mechanical power input from the engine or electric motor.   
   
   
       5 . The method according to  claim 4 , wherein the volume output is increased at least 3%. 
   
   
       6 . The method according to  claim 4 , wherein the volume output is increased at least 5%. 
   
   
       7 . The method according to  claim 1 , wherein a constancy of the power output is increased. 
   
   
       8 . The method according to  claim 1 , wherein a constancy of the power output is increased at the maximum load. 
   
   
       9 . The method according to  claim 7 , wherein the drop of the power output after at least 10 minutes of operating time is at most 3%, measured at a load of 90% of the maximum load or more of a unit providing mechanical energy. 
   
   
       10 . The method according to  claim 1 , wherein the engine speed of a unit providing mechanical energy is maintained at a constant rate and the system delivers an increased level of hydraulic power. 
   
   
       11 . The method according to  claim 1 , wherein the pressure provided by a unit providing hydraulic power is in the range of 50 to 700 bar. 
   
   
       12 . The method according to  claim 1 , wherein the pressure provided by a unit providing hydraulic power is in the range of 150 to 350 bar. 
   
   
       13 . The method according to  claim 1 , wherein the hydraulic system is designed to operate at a lower pressure, such that the output power is equivalent to that delivered by a reference system using a hydraulic fluid with a VI of 100. 
   
   
       14 . The method according to  claim 1 , wherein the hydraulic system demonstrates an improvement in the ratio of hydraulic power output to power input, such that the ratio of power output/power input is improved by at least 3%, compared to that delivered by a reference system using a hydraulic fluid with a VI of 100. 
   
   
       15 . The method according to  claims 1 , wherein the hydraulic fluid has a VI of at least 150. 
   
   
       16 . The method according to  claim 1 , wherein the hydraulic fluid has a VI of at least 180. 
   
   
       17 . The method according to  claim 1 , wherein the hydraulic fluid is a NFPA double viscosity grade, triple viscosity grade, quadra viscosity grade, or penta viscosity grade hydraulic fluid. 
   
   
       18 . The method according to  claim 1 , wherein the hydraulic fluid is obtained by mixing a base fluid and a polymeric viscosity index improver. 
   
   
       19 . The method according to  claim 1 , wherein the hydraulic fluid comprises at least 60% by weight of at least one base fluid. 
   
   
       20 . The method according to  claim 1 , wherein the hydraulic fluid comprises at least 60% by weight of at least one base fluid having a viscosity index of 120 or less. 
   
   
       21 . The method according to  claim 1 , wherein the hydraulic fluid comprises a member selected from the group consisting of a mineral oil, a synthetic oil and mixtures thereof. 
   
   
       22 . The method according to  claim 1 , wherein the hydraulic fluid comprises an API group I oil, API group II oil, API group III oil, a API group IV oil, API group V oil, a Fischer-Tropsch (GTL) derived oil or mixtures thereof. 
   
   
       23 . The method according to  claim 1 , wherein the hydraulic fluid comprises a polyalphaolefin, a carboxylic ester, a vegetable ester, a phosphate ester, a polyalkylene glycol or mixtures thereof. 
   
   
       24 . The method according to  claim 1 , wherein the hydraulic fluid comprises at least one polymer. 
   
   
       25 . The method according to  claim 24 , wherein the polymer comprises polymerized units from monomers selected from the group consisting of acrylate monomers, methacrylate monomers, fumarate monomers, maleate monomers and mixtures thereof. 
   
   
       26 . The method according to  claim 1 , wherein the hydraulic fluid comprises a polyalkylmethacrylate polymer. 
   
   
       27 . The method according to  claim 1 , wherein the hydraulic fluid comprises a polymer obtained by polymerizing a mixture of olefinically unsaturated monomers, which comprises
 a) 0-100 wt % of one or more ethylenically unsaturated ester compounds of formula (I) based on the total weight of the ethylenically unsaturated monomers:   
     
       
         
         
             
             
         
       
       wherein 
       R is hydrogen or methyl, 
       R 1  is a linear or branched alkyl residue with 1-6 carbon atoms, 
       R 2  and R each independently represent hydrogen or a group of the formula COO′, wherein R′ is hydrogen or an alkyl group with 1-6 carbon atoms, 
       b) 0-100 wt % of one or more ethylenically unsaturated ester compounds of formula (II) based on the total weight of the ethylenically unsaturated monomers: 
     
     
       
         
         
             
             
         
       
       wherein 
       R is hydrogen or methyl, 
       R 4  is a linear or branched alkyl residue with 7-40 carbon atoms, R 5  and R 6  independently are hydrogen or a group of the formula —COOR′, wherein R″ is hydrogen or an alkyl group with 7-40 carbon atoms, 
       c) 0-50 wt % of comonomers based on the total weight of the ethylenically unsaturated monomers. 
     
   
   
       28 . The method according to  claim 24 , wherein the polymer is obtained by a polymerization in a API group II mineral oil or API group III mineral oil. 
   
   
       29 . The method according to  claim 24 , wherein the polymer is obtained by a polymerization in a polyalphaolefin. 
   
   
       30 . The method according to  claim 24 , wherein the polymer is obtained by polymerizing a dispersant monomer. 
   
   
       31 . The method according to  claim 24 , wherein the polymer is obtained by polymerizing a vinyl monomer containing an aromatic group. 
   
   
       32 . The method according to  claim 24 , wherein the polymer has a weight average molecular weight in the range of 10000 to 200000 g/mol. 
   
   
       33 . The method according to  claim 1 , wherein the hydraulic fluid comprises 0.5 to 40% by weight of a polymer. 
   
   
       34 . The method according to  claim 1 , wherein the hydraulic fluid comprises 3 to 20% by weight of a polymer. 
   
   
       35 . The method according to  claim 24 , wherein the hydraulic fluid comprises at least two polymers having a different monomer composition. 
   
   
       36 . The method according to  claim 35 , wherein at least one of the polymers is a polyolefin. 
   
   
       37 . The method according to  claim 36 , wherein at least one of the polymers comprises units derived from at least one alkyl ester monomer. 
   
   
       38 . The method according to  claim 37 , wherein a weight ratio of the polyolefin and the polymer comprising units derived from at least one alkyl ester monomer is in the range of 1:10 to 10:1. 
   
   
       39 . The method according to  claim 1 , wherein the hydraulic fluid comprises an oxygen containing compound selected from the group consisting of carboxylic acid esters, polyether polyols, organophosphorus compounds and mixtures thereof. 
   
   
       40 . The method according to  claim 39 , wherein the oxygen containing compound is a carboxylic ester containing at least two ester groups. 
   
   
       41 . The method according to  claim 39 , wherein the oxygen containing compound is a diester of a carboxylic acid containing 4 to 12 carbon atoms. 
   
   
       42 . The method according to  claim 39 , wherein the oxygen containing compound is an ester of a polyol. 
   
   
       43 . The method according to  claim 1 , wherein the hydraulic fluid has an ISO viscosity grade in the range of 15 to 150. 
   
   
       44 . The method according to  claim 1 , wherein the hydraulic fluid is used at a temperature in the range of −40° C. to 120° C. 
   
   
       45 . The method according to  claim 1 , wherein the hydraulic fluid comprises a member selected from the group consisting of antioxidants, antiwear agents, corrosion inhibitors, defoamers and mixtures thereof. 
   
   
       46 . The method according to  claim 1 , wherein said hydraulic system is a military hydraulic system, a hydraulic launch assist system for hydraulic hybrid vehicle propulsion, an industrial hydraulic system, marine hydraulic system, mining hydraulic system, mobile equipment hydraulic system or combinations thereof. 
   
   
       47 . The method according to  claim 1 , wherein said hydraulic system comprises at least one unit providing mechanical energy, at least one unit that converts mechanical energy into hydraulic power, at least one pipe for transmitting hydraulic fluid under pressure and at least a unit that converts the hydraulic power of the hydraulic fluid into mechanical work. 
   
   
       48 . The method according to  claim 47 , wherein the unit providing mechanical energy comprises a combustion engine. 
   
   
       49 . The method according to  claim 47 , wherein the unit converting mechanical energy into hydraulic power is a vane pump. 
   
   
       50 . The method according to  claim 47 , wherein the unit converting mechanical energy into hydraulic power is a piston pump. 
   
   
       51 . The method according to  claim 47 , wherein the unit converting mechanical energy into hydraulic power is a gear pump. 
   
   
       52 . A hydraulic system, comprising:
 a hydraulic fluid having a VI of at least 130;   wherein a power output of said hydraulic system is increased at least 3% compared to the power output of a hydraulic system using a monograde hydraulic fluid having a VI of about 100, operating at the same pressure and temperature with identical mechanical power input from the engine or electric motor;   wherein said hydraulic system is a military hydraulic system, a hydraulic launch assist system for hydraulic hybrid vehicle propulsion, an industrial hydraulic system, marine hydraulic system, mining hydraulic system, mobile equipment hydraulic system or combinations thereof.   
   
   
       53 . A hydraulic system, comprising:
 a hydraulic fluid having a VI of at least 130;   wherein a power output of said hydraulic system is increased at least 3% compared to the power output of a hydraulic system using a monograde hydraulic fluid having a VI of about 100, operating at the same pressure and temperature with identical mechanical power input from the engine or electric motor;   wherein said hydraulic system comprises at least one unit providing mechanical energy, at least one unit that converts mechanical energy into hydraulic power, at least one pipe for transmitting hydraulic fluid under pressure and at least a unit that converts the hydraulic power of the hydraulic fluid into mechanical work.   
   
   
       54 . The hydraulic system according to  claim 53 , wherein the unit providing mechanical energy comprises a combustion engine. 
   
   
       55 . The hydraulic system according to  claim 53 , wherein the unit converting mechanical energy into hydraulic power is a vane pump. 
   
   
       56 . The hydraulic system according to  claim 53 , wherein the unit converting mechanical energy into hydraulic power is a piston pump. 
   
   
       57 . The hydraulic system according to  claim 53 , wherein the unit converting mechanical energy into hydraulic power is a gear pump.

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