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关于BJ492Q汽油机连杆大头与杆身成30°角的斜油孔的作用及合理位置的探讨。《汽车技术》1980年第5期“关于BJ492Q发动机几个问题的说明”一文中介绍,BJ492Q汽油机连杆大头端与杆身成30°角、孔径为φ4和φ2的阶梯形斜油孔的作用是使主油道的压力油间歇的直喷到活塞顶端,从而使活塞得到冷却。我认为这个问题值得探讨。图1所示为BJ492Q汽油机连杆大头斜油孔与曲轴的连杆颈上的油道口重合时的位置。此时,机油由斜油孔喷出。图中箭头所指为机油喷射的方向。由图可知,从斜油孔喷出的机油是喷向曲轴箱内壁的,而不是“喷到活塞顶端”。所以,该部份润滑油路并未起到应有的作用。
On the BJ492Q gasoline engine connecting rod and the body into a 30 ° angle of the role of oblique hole and a reasonable position discussion. “Automotive Technology” 1980 the fifth period “on the BJ492Q several issues described in the article,” introduced a text, BJ492Q gasoline engine connecting rod end of a large angle of 30 ° angle with a diameter of φ4 and φ2 stepped inclined hole role Is to make the main oil pressure intermittently oil directly to the piston top, so that the piston is cooled. I think this issue is worth exploring. Figure 1 shows the location of the BJ492Q gasoline engine connecting rod big inclined oil hole coincides with the oil passage on the connecting rod neck of the crankshaft. At this moment, the oil is jetted from the inclined hole. The arrow in the figure indicates the direction of oil jet. It can be seen from the figure that the oil sprayed from the inclined oil hole is sprayed to the inner wall of the crankcase instead of being sprayed onto the top of the piston. Therefore, the part of the lubricating oil does not play its due role.