(19)

(11)

EP 1 171 707 A1

(12)

(43) Date of publication: 16.01.2002 Bulletin 2002/03 (21) Application number: 00923379.2 (22) Date of filing: 14.04.2000

(51) International Patent Classification (IPC)7: F02M 59/36, F02M 41/12, F02M 63/02 (86) International application number: PCT/US0010/136 (87) International publication number: WO 0063/551 (26.10.2000 Gazette 2000/43)

(84) Designated Contracting States: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 16.04.1999 US 129699 P 16.04.1999 US 129700 P (71) Applicant: CATERPILLAR INC. Peoria Illinois 61629-6490 (US)	(72) Inventors: GIBSON, Dennis, H. Chillicothe, IL 61523 (US) SOMMARS, Mark, F. Sparland, IL 61565 (US) BLASS, James, R. Bloomington, IL 61704-8412 (US) (74) Representative: Wagner, Karl H., Dipl.-Ing.  Wagner & Geyer, Patentanwälte, Gewürzmühlstrasse 5 80538 München 80538 München (DE)