公开(公告)号：EP2492482A1

公开(公告)日：2012-08-29

申请号：EP10824716.4

申请日：2010-08-02

申请人： Niigata Power Systems Co., Ltd.

发明人： GOTO, Satoru ,  HASHIMOTO, Toru ,  WATANABE, Koichi

IPC分类号： F02F3/00 ,  F02F3/22 ,  F16J9/00 ,  F16J10/02

CPC分类号： F16J9/22 ,  F02F1/18 ,  F02F3/00 ,  F16J1/00 ,  F16J1/09 ,  F16J9/00 ,  F16J15/28

摘要： A piston is provided in which the amount of uncombusted and discharged air-fuel mixture is small, and agglutination of a piston ring due to heat is prevented.
In a piston 2 in which plural peripheral grooves in which piston rings are provided are formed in an outer peripheral surface, as the relation between an inner diameter B of a cylinder 1 and a distance L between an upper surface of the piston and an upper surface of a top peripheral groove 4a, L/B ≤ 0.1 holds. A cooling chamber 5a is formed in close vicinity to the top peripheral groove. A dead volume S partitioned with the piston, a cylinder liner 11 and a top piston ring 3a is reduced, and the amount of air-fuel mixture enclosed here and discharged in uncombusted state is reduced. Further, agglutination of the top piston ring to the cylinder due to thermal load can be prevented with the cooling chamber 5a. The thermal efficiency as an engine is improved in comparison with conventional art.

摘要翻译： 提供了一种活塞，其中未燃和排出的空气燃料混合物的量很小，并且防止了由于热量引起的活塞环的凝集。 在其外周面上形成有多个设有活塞环的周向槽的活塞2中，作为气缸1的内径B与活塞的上表面之间的距离L的关系， 的顶部周边槽4a，L / B‰¤0.1。 冷却室5a形成在靠近顶部周边槽的位置。 与活塞隔开的死体积S减小，气缸套11和顶部活塞环3a减少，并且在这里封闭的空气 - 燃料混合物的量在未燃烧状态下被排出。 此外，通过冷却室5a可以防止由于热负荷而使顶部活塞环与气缸的凝集。 与传统技术相比，作为发动机的热效率得到改善。