(19)
(11) EP 2 955 379 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
20.01.2016 Bulletin 2016/03

(43) Date of publication A2:
16.12.2015 Bulletin 2015/51

(21) Application number: 15163556.2

(22) Date of filing: 14.04.2015
(51) International Patent Classification (IPC): 
F04B 49/12(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA

(30) Priority: 14.04.2014 US 201461979291 P

(71) Applicant: Parker-Hannifin Corporation
Cleveland, Ohio 44124-4141 (US)

(72) Inventors:
  • Heathcoat, David Mark Jr
    Greeneville, TN Tennessee 37745 (US)
  • Gray, Roger
    Greeneville, TN Tennessee 37745 (US)
  • Lola, Kirk Ayres
    Rutherfordton, NC North Carolina 27139 (US)
  • Brock, Kerry
    Forest City, NC North Carolina 28043 (US)
  • Crosby, Michael T
    Jonesborough, TN Tennessee 37659 (US)

(74) Representative: Belcher, Simon James 
Urquhart-Dykes & Lord LLP Tower North Central Merrion Way
Leeds LS2 8PA
Leeds LS2 8PA (GB)

   


(54) HYDRAULICALLY CONTROLLED HYDROSTATIC TRANSMISSION


(57) A hydrostatic transmission system includes a pump including a rotatable swashplate. Rotation of the swashplate effects a change in volumetric displacement of the pump. An actuator is coupled to the swashplate and effects rotation of the swashplate to change the volumetric displacement of the pump. An electronic controller is operatively coupled to the actuator and commands the actuator to effect rotation of the swashplate.







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