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    • 5. 发明授权
    • Piston having a central cooling gallery with a contoured flange
    • 活塞具有中央冷却库,带轮廓法兰
    • US08065985B2
    • 2011-11-29
    • US12434713
    • 2009-05-04
    • Norbert Schneider
    • Norbert Schneider
    • F02F3/00
    • F02F3/003F02B23/0696F02F3/22Y02T10/125
    • A piston has an upper crown portion with an upper combustion wall against which combustion forces act and a lower crown portion with a pair of pin bosses spaced for receipt of a small end of a connecting rod therebetween. The upper crown portion and the lower crown portion form an outer oil gallery and a central oil gallery in fluid communication with one another. The central oil gallery is formed in part by an annular flange extending radially inwardly from the outer oil gallery and upwardly toward the upper combustion wall to a free edge spaced from the upper combustion wall. The free edge forms an opening about a central axis of the piston and has a non-planar uppermost surface with depressions aligned diametrically opposite one another across the opening to improve the oil flow throughout the central oil gallery.
    • 活塞具有上冠部,其具有燃烧力作用的上燃烧壁和具有一对销凸起的下冠部,其间隔开以容纳连接杆的小端。 上冠部和下冠部形成外部油道和中心油画廊,彼此流体连通。 中央油库部分地由从外油道径向向内延伸的环形凸缘形成,并且朝向上燃烧壁向上延伸到与上燃烧壁间隔开的自由边缘。 自由边缘围绕活塞的中心轴线形成开口,并且具有不平坦的最上表面,其凹陷沿开口对齐地彼此沿径向相对,以改善贯穿中央油画廊的油流。