A synchronizing system for hydraulic four wheel steering

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(11)

EP 2 586 680 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	Note: Bibliography reflects the latest situation

(15)	Correction information:
	Corrected version no 1 (W1 A1)

(48)	Corrigendum issued on:
	30.10.2013 Bulletin 2013/44

(88)	Date of publication A3:
	01.05.2013 Bulletin 2013/18

(43)	Date of publication:
	01.05.2013 Bulletin 2013/18

(21)	Application number: 12189610.4

(22)	Date of filing: 23.10.2012

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International Patent Classification (IPC):

B62D 7/14^(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

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Priority:

28.10.2011 US 201113284179

(71)	Applicant: DEERE & COMPANY
	Moline, Illinois 61265-8098 (US)

(72)	Inventor:
	Mergener, Travis Horicon, WI Wisconsin 53032 (US)

(74)	Representative: Dehnhardt, Florian Christopher
	John Deere GmbH & Co. KG Global Intellectual Property Services John-Deere-Straße 70 68163 Mannheim 68163 Mannheim (DE)

(54)	A synchronizing system for hydraulic four wheel steering

(57) A synchronizing system (10) for hydraulic four wheel steering comprising: a double acting front steering cylinder (32) mounted between a stationary member (41) and a front wheel support assembly (20); a double acting rear steering cylinder (34) mounted between a stationary member (43) and a rear wheel support assembly (24); and a synchronizing valve assembly (36) connected by hydraulic lines between the front and the rear steering cylinders, the assembly having a pair of directional relief valves (38,40) that can open to synchronize the positions of the front and the rear steering cylinders.