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Home xin In the design of reducer shafting, the diameter of the shaft shall be rounded after calculation. What is the corresponding rounding standard value in the mechanical design manual?

In the design of reducer shafting, the diameter of the shaft shall be rounded after calculation. What is the corresponding rounding standard value in the mechanical design manual?

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The minimum journal I calculated is 42.63mm. How many circles do you want to round? What is the rounding value nearby

the national standard consists of a series of recommended dimensions, and the standard number is gb2822 — 81. The standard is only a guiding thing, but in the actual design work, the specific size value should be determined according to the actual structural size. The value you said should be rounded to 43 If rounded to 4 and 5. However, if the structure allows, if there are no requirements for the quality of parts, it may as well be made into 45, which is an industry habit. In the actual mechanical design example, because there are many constraints, such as structure, part quality and so on, many size values are very different, and it is impossible to do all according to the series size recommended by the standard. Nominal sizes with decimal points are also allowed.

it’s better to be 45. Considering that the dimensions of the bearing and retaining ring circlip are standard, this dimension is easier to do. In addition, you can multiply the safety factor by 50

if you check the size series in the mechanical parts manual, it should be 45. The diameter of the shaft can only be rounded to the large, not to the small, otherwise the strength of the shaft is insufficient

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this is based on the corresponding rounding value in the mechanical design manual

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