Global patent index - EP 1004765 A1

EP 1004765 A1 2000-05-31 - Clyinder head structure of internal combustion engines for mitigating thermal stress

Title (en)

Clyinder head structure of internal combustion engines for mitigating thermal stress

Title (de)

Zylinderkopfvorrichtung einer Brennkraftmaschine zur thermischen Spannungsverminderung

Title (fr)

Dispositif de culasse de moteur à explosion pour diminuer les contraintes thermiques

Publication

EP 1004765 A1 (EN)

Application

EP 99123425 A

Priority

JP 33381898 A

Abstract (en)

A cylinder head (2) of an internal combustion engine is connected to a cylinder block (11) that has a cylinder bore (13). A bottom surface (2a) faces the cylinder block (11). The bottom surface (2a) has two ceiling surfaces (6). The ceiling surfaces (6) and the cylinder bore (13) define a combustion chamber (15). A slit (16) is formed on the bottom surface (2a) adjacent the ceiling surface (6) to mitigate thermal stress in the cylinder head (2). The slit (16) has a deepest part (16a) located near a center of the ceiling surfaces (6). The depth of the slit (16) decreases as the distance from the maximum depth part (16a) increases. The slit (16) is separated from other spaces in the cylinder head (2). This cylinder head structure sufficiently mitigates thermal stress and maintains the strength of the cylinder head (2). <IMAGE>

IPC 1-7 (main, further and additional classification)

F02F 1/38

IPC 8 full level (invention and additional information)

F02F 1/24 (2006.01); F02F 1/42 (2006.01); F02B 3/06 (2006.01)

CPC (invention and additional information)

F02F 1/4214 (2013.01); F02B 3/06 (2013.01); F02B 2275/18 (2013.01); F02F 2001/245 (2013.01); F02F 2001/248 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

EP 1004765 A1 20000531; JP 2000161128 A 20000613

INPADOC legal status

2002-12-11 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20020601

2001-02-14 [AKX] PAYMENT OF DESIGNATION FEES

- Ref Legal Event Code: AKX

- Free Format Text: DE FR GB

2000-05-31 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 19991124

2000-05-31 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB

2000-05-31 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Ref Legal Event Code: AX

- Free Format Text: AL;LT;LV;MK;RO;SI