(19)

(11)

EP 1 631 755 A2

(12)

(88) Date of publication A3: 12.05.2005 (43) Date of publication: 08.03.2006 Bulletin 2006/10 (21) Application number: 04736676.0 (22) Date of filing: 11.06.2004

(51) International Patent Classification (IPC):  F16H 1/20(1968.09) (86) International application number: PCT/IB2004/001972 (87) International publication number: WO 2004/111492 (23.12.2004 Gazette 2004/52)

(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 PL PT RO SE SI SK TR (30) Priority: 12.06.2003 IT BO20030360 (71) Applicant: STM S.P.A. 40012 Lippo di Calderara di Reno Bologna (IT)	(72) Inventors: MORSELLI, Mario, Antonio I-41100 Modena (IT) TOTTI, Stefano I-40017 S. Giovanni in Persiceto (IT) (74) Representative: Provvisionato, Paolo  Provvisionato & Co S.r.l. Piazza Porta di Mascarella 7 40126 Bologna 40126 Bologna (IT)