(19)
(11) EP 0 288 096 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
07.02.1990 Bulletin 1990/06

(43) Date of publication A2:
26.10.1988 Bulletin 1988/43

(21) Application number: 88200499.7

(22) Date of filing: 17.03.1988
(51) International Patent Classification (IPC)4: F02F 1/18, F02F 1/20
(84) Designated Contracting States:
AT CH DE FR GB LI NL SE

(30) Priority: 21.04.1987 DE 8705785 U

(71) Applicant: Stork-Wärtsilä Diesel B.V.
NL-8017 AA Zwolle (NL)

(72) Inventor:
  • Sterken, Johan
    NL-7735 KA Arrien (Ommen) (NL)

(74) Representative: 't Jong, Bastiaan Jacobus et al
Arnold & Siedsma, Advocaten en Octrooigemachtigden, Sweelinckplein 1
2517 GK Den Haag
2517 GK Den Haag (NL)


(56) References cited: : 
   
       


    (54) Piston combustion engine


    (57) Piston combustion engine (1) comprising an engine block with at least one cylinder (2), a cylinder head (3) provided with in­let and exhaust channels (4,5) and closing off said cylinder at one end, and a piston (9) accommodated in said cylinder which is guided reciprocally between a top dead centre close to said cylinder head (3) and a bottom dead centre at a stroke length therefrom, said piston (9) bearing a number of piston rings (12) that are in sliding contact with the inner wall (13) of said cylinder (2). At least a portion (15) of said inner wall (13) of said cylinder (2) between said cylinder head (3) and the level of the uppermost piston ring (12) at the top dead centre of said piston, has a greater surface roughness relative to that of the surface of the peripheral wall (17) of said piston (9) above the uppermost piston ring (12).







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