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Method for coating the outer surface of a cylinder bushing

A cylinder liner and outer surface technology, applied to cylinders, cylinder heads, hot-dip coating process, etc., can solve problems such as general strength, easy oxidation, and adverse effects on connection quality

Inactive Publication Date: 2008-08-27
MAHLE INT GMBH
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  • Summary
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AI Technical Summary

Problems solved by technology

The disadvantage of this state-of-the-art coating is that it is highly susceptible to oxidation and has a mediocre strength which adversely affects the quality of the connection of the coating to the casting material of the cylinder oil tank

Method used

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Embodiment Construction

[0007] Therefore, a cylinder liner is provided, which is made of iron as the main raw material, which can be alloy or non-alloy. Preferably, gray cast iron may be used to manufacture the cylinder liner, and such gray cast iron may contain lamellar graphite, milky graphite, or nodular graphite. Such gray cast iron may have a ferrite-pearlite, pearlite, bainite, or austenite basic structure. The outer surface of the cylinder liner may be smooth and all other surfaces shall be at least of the quality of grained gray cast iron. For this reason, the outer surface, end surface and inner side of the cylinder liner need to be pretreated by turning.

[0008] In order to cast the cylinder liner into the cylinder oil tank, various casting methods are used, such as a pressure casting method, a stamping casting method, a heavy pressure casting method, or a low pressure casting method.

[0009] The cylinder liner is manufactured using light metal casting materials, among which, not only c...

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Abstract

The invention relates to a method for coating the outer surface of a cylinder bushing. A small segment of the cylinder bushing is immersed into a melt which consists of a zinc based alloy comprising alloy components of aluminium and copper and which extends in a continuous manner over the entire axial length of the cylinder bushing, after cleaning and roughening the external surface, and said cylinder bushing is rotated about the longitudinal axis thereof, until a metal layer is formed on the outer surface of the cylinder bushing, which extends in a continuous manner over the entire length thereof and which consists of a zinc based alloy. The copper prevents an oxide skin, which is difficult to remove from the metal layer, from forming and also increases rigidity in the binding layer.

Description

technical field [0001] The invention relates to a method for coating the outer surface of a cylinder liner according to the general concept of claim 1 . Background technique [0002] In order to reduce the weight of the car and save fuel when driving, the cylinder oil tank is usually cast from lightweight materials, especially aluminum. However, the friction characteristics of the cylinder oil tank manufactured by this method are not good. When the cylinder oil tank is mainly made of iron such as gray cast iron, the liner in the cylinder oil tank needs to be cast together. Therefore there will be such a problem that the liner in the cylinder oil tank must be firmly fixed, and sufficient heat dissipation can be ensured between the liner and the oil tank. In order to solve this problem, the outer surface of the cylinder liner is roughened in a subsequent cutting process. The problem with this method, however, is that the diverter blades located between the cylinder liners ca...

Claims

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Application Information

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IPC IPC(8): F02F1/00B22D19/00C23G1/24C23C22/78
CPCC23C2/02F02F1/00B22D19/0009C23C2/38B22D19/0081C23C2/36C23C2/024
Inventor 格哈德·布赫尔
Owner MAHLE INT GMBH
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