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2. 发明申请

WO2017137750A1 PISTON BOWL FOR AN INTERNAL COMBUSTION ENGINE 审中-公开
标题翻译：活塞碗用于内燃机
公开(公告)号：WO2017137750A1
公开(公告)日：2017-08-17
申请号：PCT/GB2017/050325
申请日：2017-02-09
申请人： PERKINS ENGINES COMPANY LIMITED
发明人： PARSI, Mohammad
IPC分类号： F02F3/28 , F02B23/06
CPC分类号： F02B23/0672 , F02F3/00 , F02F3/28 , F16J1/00 , Y02T10/125
摘要： A piston crown for a piston of an internal combustion engine, the piston crown extending in an axial direction along a central axis and in a radial direction outwardly from the central axis. The piston crown comprises an annular surface at a first end of the piston crown in the axial direction; and a piston bowl located radially within the annular surface and recessed relative to the first end of the piston crown. The piston bowl comprises a raised floor in a radially central region of the piston bowl; an arcuate surface located radially outward relative to the raised floor; and a lip chamfer surface extending radially outwardly from the arcuate surface and radially inwardly from the annular surface. A radially inmost portion of the lip chamfer surface is radially inside the radially outermost portion of the arcuate surface. A bowl maximum radius, R max , is defined as a distance in the radial direction between the central axis of the piston crown and an innermost edge of the annular surface. A bowl height, H, is defined as a distance in the axial direction between the annular surface and a surface of the piston bowl furthest from the annular surface. A lip re-entrancy angle is defined as an acute angle between a line extending in the radial direction at the first end of the piston crown and a tangent to the arcuate surface closest to the first end of the piston crown. The bowl maximum radius, R max , is between 2.3 and 3.2 times the bowl height, H, and the lip re-entrancy angle is between 40° and 80 °.
摘要翻译：用于内燃机的活塞的活塞顶部，所述活塞顶部沿着中心轴线在轴向方向上并且在从所述中心轴线向外的径向方向上延伸。活塞顶部包括在活塞顶部的第一端处的轴向方向上的环形表面; 以及径向位于所述环形表面内并且相对于所述活塞顶的所述第一端凹入的活塞碗。活塞碗包括在活塞碗的径向中心区域中的高起地板; 相对于所述高架地板径向向外定位的弓形表面; 以及从所述弧形表面径向向外并从所述环形表面径向向内延伸的唇形倒角表面。唇形倒角表面的径向最内部分在弧形表面的径向最外部分的径向内侧。碗的最大半径R max被定义为活塞顶部的中心轴线与环形表面的最内部边缘之间在径向方向上的距离。碗的高度H定义为环形表面与活塞筒的距离环形表面最远的表面之间沿轴向的距离。唇再入入角被定义为在活塞顶的第一端处沿径向方向延伸的线与最靠近活塞顶的第一端的弧形表面的切线之间的锐角。碗的最大半径R max在碗高度的2.3和3.2倍之间，并且唇重入角在40°和40°之间。和80°。

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