The utility model relates to a crankshaft crank arm, which is characterized in that the two sides of the crank arm are respectively composed of an upper straight face and a lower straight face transiting by fillet I. The top face of the crank arm is composed of an arch face and a transition straight face tangentially connected with both ends of the arch face, and the transition straight face is favorable to the upper straight face of the corresponding side. Connected by rounded angle II, the lower straight faces on both sides are connected by an arc bottom surface, and the two ends of the arc bottom surface and the lower straight face are transited by rounded angle III. The angle between the lower straight face and the horizontal plane is 88.5_, the angle between the upper straight face and the horizontal plane is 80_, and the angle between the transition straight face and the upper straight face is 39_. The radius of the rounded corner I, the rounded corner II and the rounded corner III are equal. The diameter of the outer circle of the technological platform of the thrust surface corresponding to the main journal of the crank arm is larger than the distance between the inflection points on both sides of the crank arm. The utility model has reasonable structure and reliable use, not only has good assembly effect with the main shaft neck, but also has good dynamic balance.
【技术实现步骤摘要】
曲轴曲柄臂
本技术涉及曲轴组件,特别是一种曲轴曲柄臂。
技术介绍
曲轴是内燃机核心部件,其主要由主轴颈、连杆轴颈、曲柄臂、前、后端轴组成,其中曲柄臂自带与其一体的平衡重部分。现有的曲柄臂两侧面为直面(参见图2),曲柄臂对应主轴颈的止推面工艺台的外圆直径小,与两侧直面的间距相等,与主轴颈装配时接触面积小,影响装配稳定性。同时曲柄臂的两侧直面设计不利于曲柄臂折动平衡。
技术实现思路
本技术的目的是为了提供一种克服现有曲柄臂上述缺陷的曲轴曲柄臂,结构合理、使用可靠,不仅与主轴颈装配效果好,而且动平衡好。本技术的技术方案是:一种曲轴曲柄臂,其特征在于:所述曲柄臂的两侧面分别由利用圆角Ⅰ过渡的上直面和下直面构成,所述曲柄臂的顶面由拱形面和与拱形面两端切向连接的过渡直面构成,所述过渡直面与对应侧的上直面之间利用圆角Ⅱ连接,两侧的下直面之间利用弧形底面连接,弧形底面两端与下直面之间利用圆角Ⅲ过渡,所述下直面与水平面的夹角为88.5º,所述上直面与水平面的夹角为80º,所述过渡直面与上直面的向上的延展面的夹角为39º,所述圆角Ⅰ、圆角Ⅱ和圆角Ⅲ的半径相等,所述曲柄臂对应主轴颈的止推面工艺台的外圆直径大于所述曲柄臂两侧面的拐点之间的距离。上述的曲轴曲柄臂,所述曲柄臂顶面的拱形面的弧心与曲柄臂的连杆轴颈的中心线重合。上述的曲轴曲柄臂,所述曲柄臂的弧形底面的弧心与曲柄臂的主轴颈的中心线重合。上述的曲轴曲柄臂,所述圆角Ⅰ、圆角Ⅱ和圆角Ⅲ的半径为20mm。上述的曲轴曲柄臂,所述曲柄臂两侧面的拐点之间的距离为126mm,所述曲柄臂对应主轴颈的止推面工艺台的外圆直径为134mm。本技术的有 ...
【技术保护点】
1.一种曲轴曲柄臂,其特征在于:所述曲柄臂的两侧面分别由利用圆角Ⅰ过渡的上直面和下直面构成,所述曲柄臂的顶面由拱形面和与拱形面两端切向连接的过渡直面构成,所述过渡直面与对应侧的上直面之间利用圆角Ⅱ连接,两侧的下直面之间利用弧形底面连接,弧形底面两端与下直面之间利用圆角Ⅲ过渡,所述下直面与水平面的夹角为88.5º,所述上直面与水平面的夹角为80º,所述过渡直面与上直面的向上的延展面的夹角为39º,所述圆角Ⅰ、圆角Ⅱ和圆角Ⅲ的半径相等,所述曲柄臂对应主轴颈的止推面工艺台的外圆直径大于所述曲柄臂两侧面的拐点之间的距离。
【技术特征摘要】
1.一种曲轴曲柄臂,其特征在于:所述曲柄臂的两侧面分别由利用圆角Ⅰ过渡的上直面和下直面构成,所述曲柄臂的顶面由拱形面和与拱形面两端切向连接的过渡直面构成,所述过渡直面与对应侧的上直面之间利用圆角Ⅱ连接,两侧的下直面之间利用弧形底面连接,弧形底面两端与下直面之间利用圆角Ⅲ过渡,所述下直面与水平面的夹角为88.5º,所述上直面与水平面的夹角为80º,所述过渡直面与上直面的向上的延展面的夹角为39º,所述圆角Ⅰ、圆角Ⅱ和圆角Ⅲ的半径相等,所述曲柄臂对应主轴颈的止推面工艺台的外圆直径大于所...
【专利技术属性】
技术研发人员:臧宏臻,李智,
申请(专利权)人:辽宁科创重型内燃机曲轴有限公司,
类型:新型
国别省市:辽宁,21
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