It didn't take long for Zheng Bingshen, the inspection squad leader of the test run, to feel the scene. Pen? Interesting? Pavilion wWw. ｂiquge。 ｉｎfo

"Xiao Li, what's the situation?" Zheng Bingshen asked as he walked over to the engine.

Xiao Li is the test worker, heard Zheng Bingshen's words, and said: "Just now during the test run, this, this leader wanted to see the working status of the rocker arm, so I took off the cylinder head cover, and found that the rocker arm was not oiled." ”

Li Xiang smiled and said, "Oh, I'm not a leader, I'm from the machine body processing workshop, Master Zheng, what's the reason why this rocker arm is not oiled?" ”

Zheng Bingshen listened to Li Xiang's words, and said irrationally: "Not oiled, of course, the oil pressure is low, isn't it obvious?" Xiao Li, what is the oil pressure? ”

Xiao Li looked back at the computer on the test bench and said helplessly: "Master Zheng, the oil pressure display is normal, there is no problem." ”

After Zheng Bingshen heard this, his face changed color all of a sudden, and he said to himself: "No problem? What is the reason for that? ”

Xiao Li, the test worker, couldn't determine the reason when he saw Zheng Bingshen, so he didn't dare to slack off, and hurriedly fed back the problem to the workshop.

After a while, Chang Hailing, director of the test workshop, Liu Zonghu, a technician in the workshop, and Mu Zhongyue, director of the technical quality department, came together.

Seeing Mu Zhongyue coming, Zheng Bingshen's face changed slightly, and he hurriedly greeted him and said, "Director Mu, you are here." ”

Mu Zhongyue nodded and said, "Yes, I heard that there was a problem found in the test run here, what is the situation, and what is the reason?" ”

Zheng Bingshen hesitated for a moment and said: "That's the case, this engine was found to be oiled on one side of the gear end during the test project, and the specific reason is still being analyzed." ”

Mu Zhongyue had an unhappy expression on his face and said, "Still analyzing?" Is that the reason not found? ”

Zheng Bingshen was anxious, his eyes suddenly rolled, and he said: "I thought of a possibility, could it be that when the body is processed, the tappet hole is processed large, and then the oil does not establish an oil film between the tappet hole and the tappet, and the oil drains in advance." ”

Mu Zhongyue thought for a moment, nodded, and said, "It's not impossible, but it can't be determined until after the dismantling and inspection." ”

Listening to Zheng Bingshen's words, Li Xiang couldn't help frowning, because the reason that the other party said did exist, and the accuracy of processing tappet holes was still quite high.

The hole size of the tappet hole is 17.5mm, and the tolerance range is 0 to 0.027mm, which is a more important size, and the processing technology is to drill the hole first, then ream, and finally ream.

If the position degree cannot be guaranteed when reaming and reaming, the holes processed between the two processes may not be concentric, which will also cause an ellipse.

The elliptical phenomenon is difficult to detect with ordinary plug gauges, so the one Zheng Bingshen said may still be very large.

Li Xiang hurriedly lifted his divine eye and looked towards the tappet hole corresponding to the oiled rocker arm.

Li Xiang's divine eyes can not only see through, but also conduct accurate analysis, at this time Li Xiang frowned slightly, and knew the size of the tappet aperture.

The diameter of the tappet hole corresponding to this oilless rocker arm is 15.526mm, which does not exceed the tolerance range, which makes Li Xiang breathe a sigh of relief.

Since it is not a problem with the tappet hole, what is the reason why the rocker arm does not get oil?

Looking along the tappet and push rod, there is oil in it, indicating that there is no problem with the pressure, and the data on the computer is also consistent with the reality, and then looking up, it is a threaded plunger on the rocker arm.

The oil is connected to the oil channel hole on the rocker arm through an oil groove on the threaded plunger, which allows the oil to enter the rocker arm for lubrication.

At this time, Li Xiang found that the oil groove on the plunger did not figure out from the oil channel hole on the rocker arm at all, but staggered a distance of half a millimeter, and there was no gap between the two, and it was impossible for the oil to enter the rocker arm.

It turns out that this is the main reason why the rocker arm is not oiled!

After Li Xiang understood the problem, he stepped forward and said: "Zheng Bingshen's analysis is really good, but I don't think it's the reason for the pillar hole. ”

Mu Zhongyue saw that Li Xiang was also here at this time, and said with a smile: "Oh, Li Xiang, you are also here?" Let's talk about it. ”

Li Xiang nodded and said: "The tool used in the processing of our tappet hole is a forming knife, and with the use of the tool, the diameter of the processed hole will only get smaller and smaller, and our monitoring of the tappet hole is 100% measurement, and it will not be possible to produce an ellipse." ”

Mu Zhongyue smiled and said, "Then Li Xiang, what do you mean?" ”

Li Xiang smiled calmly and said confidently: "I think it is the oil channel hole on the rocker arm and the oil groove on the threaded plunger that do not completely coincide, which causes the oil to not go up." ”

"Who are you? Why? You're new here, right? Zheng Bingshen said a little angrily.

Li Xiang smiled slightly and said, "Yes, I'm new, but I also deduce it based on the knowledge I know and the information I have. ”

Seeing that Zheng Bingshen and Li Xiang began to argue, Mu Zhongyue opened his mouth and said: "Okay, what is the specific reason, you can't just think about it with your head, you still have to carry out a demolition inspection to see the specific reasons." ”

With the leader's speech, the engine was quickly removed from the test bench and transferred to the repair area.

A few reworkmen picked up the tools and began to disassemble the engine, not to mention the time spent on assembling the engine, but it was much faster to disassemble.

It didn't take long for one engine to be dismantled, and only the fuselage remained.

When the remaining oil flow in the engine was almost complete, Zheng Bingshen hurriedly said: "Come to an inspector and measure the diameter of the tappet hole." ”

An inspector came up with an inner dial indicator and, after checking the gauge with the pair bezel, began to measure the tappet hole.

"How? Is it out of tolerance? Zheng Bingshen asked hurriedly.

Li Xiang on the side looked very calm, after all, he already knew the result, and Mu Zhongyue was a little dissatisfied with Zheng Bingshen's performance, and shouted: "What's the hurry!" ”

Zheng Bingshen was taken aback, and retreated, and then the inspector also had the result, and said: "The measured diameter is 17.526mm, there is no out-of-tolerance, and it is within the range of process requirements." ”

Zheng Bingshen still didn't believe it, he picked up the watch and went to measure, Li Xiang didn't care about him anymore, and said: "Look, the inner hole of this tappet is oiled, which means that the oil can enter the tappet and the putter from the tappet hole, and everyone looks at these two rocker arms." ”

Li Xiang said, picked up the two rocker arms, and said: "Look at the position of the oil channel holes in them, it is clear that one is high and one is low, and the high oil channel hole does not coincide with the oil groove of the threaded plunger at all, and the oil cannot enter the rocker arm at all, so this is the fundamental reason why the rocker arm is not oiled." ”

Mu Zhongyue took two rocker arms, looked at them carefully, picked up a plunger and gestured, and said: "Li Xiang is right, this is the reason why the rocker arm is not oiled!" ”