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Ningbo Haishu YinLian Machinery Co.,Ltd

Buying tips for genuine Bitzer 4CC piston

(Summary description)The hardness of the aluminum Bitzer 4CC piston is greater than 100HB (Brinell hardness value), and the tensile strength is above 2450MPa. The content of silicon in the eutectic aluminum-silicon alloy composition of high-quality pistons can reach 13%.

Buying tips for genuine Bitzer 4CC piston

(Summary description)The hardness of the aluminum Bitzer 4CC piston is greater than 100HB (Brinell hardness value), and the tensile strength is above 2450MPa. The content of silicon in the eutectic aluminum-silicon alloy composition of high-quality pistons can reach 13%.

Information

The hardness of the aluminum Bitzer 4CC piston is greater than 100HB (Brinell hardness value), and the tensile strength is above 2450MPa. The content of silicon in the eutectic aluminum-silicon alloy composition of high-quality pistons can reach 13%. Due to the small thermal deformation rate of silicon, it has excellent thermal stability at high temperatures, but the high content of silicon in the piston material is necessary for the processing of the piston. The manufacturing process requirements are relatively high.

quality Bitzer 4CC piston

Easy to identify advantages and disadvantages of Bitzer 4CC piston:

1. Observed from the back of the Bitzer 4CC piston (the opposite side corresponding to the top), the back of the piston with high silicon content is darker, and the inner side has a very clear manufacturer logo. If the silicon content of fake or inferior pistons is extremely low, the back of the piston will be whitish (pure aluminum white);

2. Pistons produced by regular manufacturers have high density, and their specific gravity is larger than that of counterfeit and inferior pistons. Therefore, the simple identification method for Z is to put the accessory piston and the piston produced by a regular manufacturer (must be the same model, the same displacement, and the relevant size) on the electronic scale.

3. The Bitzer 4CC piston produced by a regular manufacturer requires high precision

Piston tops generally have group marks, usually A, B, C, and D groups, which are the size group marks of the piston skirt. In addition, the piston skirt has several very fine grooves, which are mainly used to store lubricating oil to enhance the lubrication function of the piston skirt. Inferior pistons cannot go through such a precise machining process due to rough machining.

The high-quality Bitzer 4CC piston skirt wall processing is very thin, and its wall thickness is uniform. It can measure the unilateral size of the piston skirt with a vernier caliper. If a digital display vernier caliper is used for measurement, the measurement result will be more accurate due to its high accuracy. If the wall thickness differs by more than 0.20mm, after the piston temperature rises, due to the uneven wall thickness of the skirt, its thermal deformation is large and uneven, so that the size of the piston skirt cannot reach its ideal perfect circle, and it is not only easy to cause leakage , And it will produce an abnormal knocking sound.

4. The cross-section of the skirt of the regular manufacturer Bitzer 4CC piston is not round

The cylindrical part from the bottom ring groove (referring to the oil ring groove) of the Bitzer 4CC piston to the bottom of the piston is the piston skirt, which acts as a guide and bears side pressure when the piston reciprocates in the cylinder. When the piston is not working, it is different from when it is working under force and heat. This is because the piston will deform to varying degrees when it is heated and stressed.

In the working state of Bitzer 4CC piston, due to force and heat, the dimensional deformation of the piston in the direction of the piston pin increases, while the deformation in the direction perpendicular to the piston pin is small. Therefore, in order to offset and adapt to its thermal deformation, ensure that the shape of the piston is cylindrical during operation to fit the inner wall of the cylinder and have a proper fit clearance. In the non-working state, the size of the head of the piston viewed from the axial direction Smaller, while the size of the skirt is slightly larger.

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