Rebirth of the Auto Giant

Chapter 109 Start the machine

"Hao Rouduo asked a good question. Everyone forgets that the lubrication system also has an oil cooler. Its function is equivalent to the water tank of the cooling system, which is used to cool the oil. The cooled oil then flows everywhere, affecting various parts.

Go in and cool down, this is its second function, and its third function is cleaning."

"The power of the engine oil comes from the oil pump. The engine oil flowing between the various parts will bring the metal powder worn off by each part to the oil pan and deposit it at the bottom of the oil pan. This is its third function."

Wang Shi said.

"I said during the last training that the engine wears out very quickly during the running-in period of a new machine, because the parts produced without running-in have rough surfaces. After the first running-in, the rough surface will be slowly worn away.

When the ideal working surface is ground away, their wear will decrease in a cliff-like manner until the surfaces between them are smooth and the wear will slow down. At this time, the wear speed returns to normal and is straight and parallel."

"This is why we require users to promptly replace the engine oil and filter during the first maintenance. If it is not replaced in time, the oil with metal powder will flow to the crankshaft, piston and cylinder liner, causing two wear and tear on these parts.

."

"Do you understand?" Wang Shi asked.

"I understand." Everyone replied in unison.

"Okay, remember, I will ask questions about the three functions of engine oil at any time."

ah?

Everyone was confused.

Wang Shi finished talking about the three functions of engine oil, and then said: "You will overhaul the engine outside in the future. There is another very critical point when it comes to the main bearing bolts of the crankshaft. In addition to the order from the middle to both sides, there is also

It needs to be completed in two or three times. The torque of the crankshaft main bearing bolt of our engine is 80, so the first round will be tightened to 30, the second round will be tightened to 60, and the third round will be tightened to 80..."

…

In order to let everyone know the entire engine assembly process more intuitively, Wang Shi led six people from the service department to personally visit the entire engine installation process from parts to engine in the engine installation workshop, and pointed out the points to pay attention to when installing each part.

.

Everyone knows that these core technologies are unknown to outsiders. Without the leadership of Wang Shi and the consent of the factory director Wang Shi, no one except the staff inside could come in.

Everyone knows that the opportunity is rare and takes it very seriously.

After attending the engine assembly workshop, Wang Shi very generously brought an engine accessory and taught everyone how to install it himself.

With Wang Shi's personal guidance, they asked the engine assembly workers during Wang Shi's absence. With the support of the engine installation workshop, the technical level of the six people improved quickly.

In the end, Wang Shi simply sent them to the engine installation workshop for a rotation at each position.

A day's workload requires assembling twenty or thirty units, and this level of proficiency is sufficient.

Until the end of the month, everyone systematically learned the engine installation technology. After the assessment, everyone assembled a new engine according to strict requirements, and it was verified by the technical department.

Engine training was the top priority and took about ten days. The rest was chassis and circuit training.

The circuit of Qianfeng tractor is relatively simple, mainly composed of the engine starting circuit, the lighting system of the front and rear headlights and the generator battery.

"This is the starter, that is, this thing. Our tractor does not need to be started by hand like Jiefang. Its working principle is that when we turn the key, the electricity from the battery passes through the key and reaches the starting relay.

This thing is mainly composed of copper coils. The electricity from the key energizes the coils inside, producing

The magnetic field connects the line to the magnetic switch of the starter under the action of magnetic force. The magnetic switch is the small part on the top of the starter." Wang Shi came to a new starter on the ground, pointed to the magnetic switch on the upper part of the starter, and then

To introduce, "The function of the magnetic switch is to compress the starter's driving gear and pass electricity to the driving motor below."

"The electricity from the starter relay causes the magnetic switch to generate magnetic force. The iron core inside slides backwards and contacts the circular contact at the back. This connects the line from the battery to the starter motor and causes the starter motor to rotate. That's it.

..." In order to make it more intuitive for everyone

Seeing the working process of the starter, Wang Shi asked the worker to find a wire, put the starter casing on the negative terminal of the battery, and connected the wire from the positive terminal of the battery to the magnetic switch terminal. The magnetic switch made a clicking sound and automatically

The pinion keeps extending outward.

Wang Shi took a screwdriver and led it down to short-circuit the starter motor and the magnetic switch terminal. There was a click, the driving pinion quickly stretched out, and then started to rotate rapidly with a hiss.

"Did you see it? First it stretched out, and then it rotated. These two actions are in sequence. Why is this happening? Do you understand? Why is it not spinning and stretching at the same time?"

"These two sequential actions are that the iron core of the magnetic switch slides first, and the driving pinion is extended through the lever first, and then the iron core slides back to connect the circular iron piece at the back. At this time, the starter motor below is connected.

, the motor starts."

"We know that this driving pinion is meshed with the engine flywheel. If it is rotated and extended at the same time, and it rotates before it is meshed well with the flywheel, the meshing will not be good and it will slip. Over time, the two gears will be worn out.

, causing difficulty in starting, so the pinion is stretched out first and meshes with the flywheel before rotating, thus preventing the two gear surfaces from being worn." Wang Shi said patiently.

Finally, Wang Shi simply disassembled the starter and explained it to everyone, so that everyone could understand the structure inside more intuitively.

In the end, everyone disassembled and assembled it several times until they mastered the working principle of disassembly and assembly of the starter.

"In the three-guarantee service, the starter often fails due to the magnetic switch and the carbon brush inside. If the magnetic switch is broken, we can just replace the magnetic switch. If the carbon brush is broken, we will directly replace the starter.

The machine assembly can also be used, and their supporting factory can't say anything about it." Anyway, it's a three-pack, and the supporting factory will recycle it.

"If the repair is outside the warranty, we can adapt to the situation. If the customer is really in difficulty, in order to reduce the burden on the customer, we can help him replace the carbon brush. If the customer is a rich man, it costs a lot of money, and we don't want to have so much trouble.

Simply replace the starter assembly, and we can earn money for its spare parts, plus maintenance costs, so we can make both ends meet." In fact, this is an unspoken rule in the industry. If this was not his own employee, Wang Shi would not be so straightforward with everyone.

explain.

"For out-of-warranty repairs, when the magnetic switch is broken, don't explain it too clearly to the customer. Just tell them that the starter is broken and cannot be repaired and needs to be replaced. There is no need to tell them that it is just the magnetic switch. Don't be so direct.

Bai, do you understand?"

"We understand... Hehe, teacher, this is not like your style." Haorou said with a double smile.

"This is not a bad thing, but it depends on what the person is doing. A person must know how to be flexible. The profit we make from selling his accessories is several times the wages."

"The water here is deep, you will have short heads in the future." Wang Shi looked at everyone's expressions of excitement and ended today's training, "Okay, that's it for today, let's continue tomorrow.

dynamo."

"Assemble this starter and use it as a three-pack in the future." After Wang Shi finished speaking, he left.

The six people installed the starter and put it away. They came outside and saw that they hadn't gotten off work yet, so they went to the driving range to help.