Manufacturing method of multifunctional positioning pin hole

1. The utility model relates to the technical field of engines, in particular to a multifunctional positioning pin hole.

Background technique:

2. When machining many complex parts of the engine, it is necessary to design positioning pin holes in the corresponding position to fix the parts as a machining benchmark. At the same time, the parts may need to be lubricated. Due to design and layout problems, there are very oil holes and machined positioning pins. Problems such as difficulty in placement of the holes occurred. For example: engine cylinder block, the front or rear end of the gear chamber is arranged on the side of the idler gear shaft and other lubricating holes need to be drilled from the bottom of the cylinder block to the position of the idler gear shaft, and the front and rear ends are exactly the positioning pin holes Layout position, so that the two holes are prone to difficulty in layout, and at the same time, the closeness of the two holes is likely to cause insufficient sealing surface of the oil pan, resulting in oil leakage problems. This type of problem occurs more frequently in larger parts such as cylinder blocks and cylinder heads.

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