A valve-actuating system for an exhaust gas recirculation system of an internal-combustion engine

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EP 1 361 344 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	21.01.2004 Bulletin 2004/04

(43)	Date of publication A2:
	12.11.2003 Bulletin 2003/46

(21)	Application number: 03010118.2

(22)	Date of filing: 05.05.2003

(51)	International Patent Classification (IPC)⁷: F01L 13/06, F02M 25/07

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
	Designated Extension States:
	AL LT LV MK

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Priority:

07.05.2002 IT TO20020377

(71)	Applicants:
	IVECO FIAT S.p.A. 10156 Torino (IT) Iveco Motorenforschung AG CH-9320 Arbon (CH)

(72)	Inventors:
	Dellora, Giancarlo 10129 Torino (IT) Schmidt, Klaus Dieter 8280 Kreuzlingen (CH)

(74)	Representative: Gervasi, Gemma, Dr.
	Notarbartolo & Gervasi S.p.A., Corso di Porta Vittoria, 9 20122 Milano 20122 Milano (IT)

(54)	A valve-actuating system for an exhaust gas recirculation system of an internal-combustion engine

(57) A valve-actuating system for an exhaust gas recirculation system, in which a camshaft has main lobes (30), which are used to induce full valve opening so as to bring about the intake of the air/fuel mixture or the expulsion of the exhaust gases, and auxiliary lobes (31) used to induce partial valve opening bringing about exhaust gas recirculation. A valve clearance regulating device (35) is provided adapted to vary the clearance between at least a first lower clearance value (D1) in which the valves (7) which are caused to be opened both by the main lobes (30) and by the auxiliary lobes (31), and a second higher clearance value (D2) in which the valves (7) which are induced to open by the main lobes (30) alone, thereby rendering the exhaust gas recirculation inoperative.

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