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ABOUT USBinzhou Donghailong Piston Co., Ltd. was established in August 2003 and is located at No. 23, Zhangfu Road, Binzhou Industrial Park. The company has a registered capital of 5 million yuan and 286 employees. The company covers
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PRODUCT CENTERThe company continues to carry out technological transformation to achieve energy saving and emission reduction, and continuously adopts high-end technology and equipment from the world (Germany, Italy, Japan) to achieve prec
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NEWSThe company is committed to the research of internal combustion engine pistons for motor vehicles, and constantly strives to develop into a scale-effective, technological, export-oriented, environmental-friendly and resource-
Judgment method of piston knocking cylinder
(1) Oil cut off cylinder by cylinder. Take the method of cutting off the oil cylinder by cylinder to determine the position of the knocking cylinder. If the oil is cut off to a certain cylinder, the sound decreases or disappears obviously, and when the oil supply is resumed, you can hear the obvious "click" sound, indicating that the cylinder The piston hits the cylinder.
(2) In order to further confirm that the piston of the cylinder knocks the cylinder, the fuel injector of the cylinder can be removed, and a small amount of CD-grade supercharged engine oil can be added to the cylinder (for sealing), and then the fuel injector can be installed to start the engine. , the knocking sound disappears or weakens, and the knocking sound reappears after running for a while, it is undoubtedly that the piston of the cylinder is knocking on the cylinder.
The main reasons for the piston knocking on the cylinder are as follows:
(1) The gap between the piston and the cylinder wall is too large. The standard clearance between piston skirt and cylinder of WD615 series engine is 0.143-0.182, and the maximum wear limit is 0.35-0.40.
(2) After the engine has been running for a period of time, the piston of the cylinder is worn, and the lubrication is not good. The fit gap between the piston and the cylinder increases due to wear, and a serious step appears slightly below the first air ring, causing the piston to knock Hit the cylinder to make abnormal noise.
(3) After the piston skirt and the cylinder have been in operation for a period of time, they are severely worn, resulting in severe out-of-roundness and knocking on the cylinder.
(4) Individual connecting rods are deformed due to various reasons, resulting in eccentric wear of the piston, enlarged clearance and knocking on the cylinder. Piston knocking on the cylinder will lead to high fuel consumption of the engine, engine oil leakage, high oil consumption and poor economy. When the piston hits the cylinder severely, it will also break the piston and damage the cylinder, so that the connecting rod will break and the cylinder block will be damaged.
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The main components of a piston engine
2023-02-14
The cylinder is where the gas mixture (gasoline and air) burns. The cylinder accommodates the piston for reciprocating motion. The cylinder head is equipped with an electric spark plug (commonly known as an electric nozzle) to ignite the mixture, as well as intake and exhaust valves. When the engine is working, the temperature of the cylinder is very high, so there are many cooling fins on the outer wall of the cylinder to expand the heat dissipation area. The arrangement of the cylinders on the engine casing (casing) is mostly star-shaped or V-shaped
Judgment method of piston knocking cylinder
2023-02-14
Cut off oil cylinder by cylinder. Take the method of cutting off the oil cylinder by cylinder to determine the position of the knocking cylinder. If the oil is cut off to a certain cylinder, the sound decreases or disappears obviously, and when the oil supply is resumed, you can hear the obvious "click" sound, indicating that the cylinder The piston hits the cylinder.
The live village is called the heart of the engine. It is one of the most important parts in the engine. Its function is to bear the gas pressure and transmit it to the connecting rod through the piston pin to drive the crankshaft to rotate. When the engine is working, the piston is directly in contact with the high-temperature gas with an instantaneous temperature of 2200 degrees Celsius, and the temperature at the top reaches 300C-400C, and the temperature distribution is uneven: the top of the piston bears a large gas pressure during the power stroke, the gasoline engine reaches 4MPar5MPa, and the diesel engine Up to 8MP~9MPa, or even higher: In addition, the line speed of the reciprocating movement of the piston in the cylinder can reach llm/s~1m/s; work under such harsh conditions.
The piston is called the "heart" of the internal combustion engine. It is not only closely related to the performance, emissions, and economy of the internal combustion engine, but also directly related to the reliability of the internal combustion engine; most of the existing piston structures are shown in Figure 1. The cooling oil passage 12, the ring bank 13, the piston pin hole and the skirt 14 are composed of four parts. The internal combustion engine piston works under the harsh conditions of high temperature, high pressure, high speed and poor lubrication. Serious and poor heat dissipation conditions, so the temperature of the piston is very high when it is working, especially its top can reach 600-700K; in addition, because the pressure of the gas on the top of the piston is very high, the top of the piston must bear a strong impact when it is working.
Cleverly install the piston pin. The piston pin and the pin hole are an interference fit. When installing, put the piston in water or engine oil and heat it evenly to 90°C~100°C. After taking it out, put the tie rod at an appropriate position between the holes of the piston pin seat, and then install the piston pin coated with engine oil in the predetermined direction. Insert it into the piston pin hole and the copper sleeve of the connecting rod.
When the temperature changes, the size and shape change should be small, and the minimum gap between the cylinder wall and the cylinder wall should be kept.
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Add : North workshop, 300m east of the intersection of Fenghuang 4th Road and wutong 9th Road, Binbei Street, Bincheng District, Binzhou City, Shandong Province
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